Bolt Carriers Gun Parts

(750 deals total)

This high quality bolt carrier group is a valuable addition to your AR15 build. Features: M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Black Nitride Finish - advanced lower friction coating that minimizes the need for lubricants and cleaning Properly staked gas key Shot peened HPT tested/MPI marked Black o-ring insert on extractor High quality BCG Made In America? Yes Select Your Finish Black Nitride Platform AR15 Bolt Material 9310 Steel Carrier Material 8620 Steel Weight(s) 11.52 oz Other Features -

With strength in mind, Toolcraft made their Bolts from heavy duty 9310 Alloy Steel and their Bolt Carriers from 8620 case-hardening aircraft grade steel. 9310 steel has a high core strength rating, high fatigue strength, and a high hardenability rating overall. Normally, 9310 steel is used for gears and crankshafts in massive trucks and large aircraft, so its easy to see why it would make an ideal Bolt for an AR. Why 9310 instead of Mil-Spec Carpenter 158 steel?

Blem/Salvage paperweight m16 / ar15 Bolt Carrier Group Parts Kit. If you can add it to the cart, it’s in stock ready to ship. 8620 carrier, bolt, cam pin, firing pin, retaining pin, gas key, screws, etc. made in USA may be nitride or phosphate This blem BCG parts kit is clearance item. All sales are final. No warranties/exchanges/returns.

DESCRIPTION Our .308 / 7.62 Bolt Carrier Group is the perfect firing mechanism for your big-bore rifle build. This high quality BCG features a mil-spec phosphate finish, is MPI/HPT and now includes a laser engraved Aero Precision 'A' logo! Carrier Features: Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Finish: Mil-spec Phosphate coating Gas Key: 4130 Steel attached with Grade 8 hardware and properly staked Firing Pin: Machined from 8740 steel and hard chrome coated Forward Assist serrations Laser engraved Aero Precision logo

SKU KIT-0484 Model Number KIT-0484 UPC KIT-0484 DETAILS PSA Nitride MPI Full-AUTO 5.56 BCG SKU: 516446953 QTY: 1 Magpul PMAG 30rd Gen2 MOE 5.56 Magazines SKU: 2 QTY: 5 FEATURES PSA Nitride MPI Full-AUTO 5.56 Bolt Carrier Group PSA 5.56 nitride MPI full-auto bolt carrier group. Bolt is Magnetic Particle Inspected (MPI). 8620 Full-auto profile bolt carrier group with 9310 steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. - Manufacturer: Palmetto State Armory - Platform: AR-15 - Bolt Finish: Nitride

100-036-669WB AR-15 Bolt Carrier Group 5.56mm Black Cartridge: 5.56 mm NATO Finish: Black Description Specs An M16 Bolt-Carrier Group That Completes Your Rifle Build Whether you're looking to finalize your latest AR build or have a spare on-hand to keep your current AR-15 running, having an M16 bolt-carrier group is a must, and this high-quality bolt-carrier group is one of the best options on the market. The carrier is machined from 8620 steel, and the bolt is machined from Carpenter 158 tool steel.

Description Join or Die Engraved Gold BCG Description: - Engraved with “Join or Die” - Titanium Nitride 5.56 Bolt Carrier Group - The carrier is made using 8620 tool steel, while the bolt head is machined from durable 9310 tool steel. - The bolt is magnetic-particle inspected to ensure that consumers get the best-possible components, and the carrier itself is heat-treated for added durability. - Bolt-carrier group weighs 12 ounces. - Designed for use in 5.56 NATO, .223 Rem., .300 Blackout and .204 Ruger AR-15 MPN#: BCG-15-223-00-035

Our bolt carrier group (BCG) is the lifeline of your AR-15. Designed for AR-15 and M16 builds, this group features high-end retaining and firing pin, gas key, and expert assembly, machined from 9310 alloy and laser engraved. The E2 bolt carrier group works better and provides longer lasting performance for your rifle build. BCG Includes: Bolt precision machined from 9310 alloy; carburized/case hardened & shot peened Ultrasonically cleaned and Nitrided Extractor, machined 4140 Tool steel alloy, hardened and Nitrided

SKU 516446953 Brand Palmetto State Armory Model Number 516446953 UPC 516446953 DETAILS Manufacturer: Palmetto State Armory Platform: AR-15 Bolt Finish: Nitride Bolt Steel: 9310 Profile: Full Auto Profile Gas Key: Grade 8 Hardened Fasteners, Staked per MilSpec FEATURES PSA 5.56 nitride MPI full-auto bolt carrier group. Bolt is Magnetic Particle Inspected (MPI). 8620 Full-auto profile bolt carrier group with 9310 steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. UPC#: 000516446953

Recoil Technologies Ion Nitride LR-308 Bolt Carrier Group - .308 WIN/6.5 Creedmoor/.243 WIN - $99.99 Don't forget to hit that thumbs up! Like what you see?  Subscribe to get deals straight to your inbox.   

This Battle Arms Development Titanium Bolt Carrier Group fills the space of an M16 profile while reducing weight substantially. The ArmorTi coating is an Aerospace surface treatment that provides ultimate durability and wear resistance.   Features - Bolt material 9310 - Billet gas key torqued and staked. - Tool steel extractor and cam pin   MPN#: 248086 UPC#: 810033781179 BAD-BCG-M16-TI

MPN#: APSL100448S SAVE on this Charging Handle and BCG Bundle! Includes: AR 308 Ambidextrous Charging Handle .308 / 7.62 Bolt Carrier Group, Complete - Black Nitride SPECS Specs Made In America? Yes Platform M5 Bolt Material 9310 Steel Carrier Material 8620 Steel Weight(s) 20.16 oz Other Features -

Featuring our NiB coated Right To Bear Lightweight carrier, weighing in at approximately 6.8 Ounces, or 194.1 Grams for you lightweight build fanatics! Using our low mass Carrier creates less reciprocating mass moving back and forth inside the action, which reduces recoil significantly. Our lightweight carrier also allows proper cycling with less gas. When used in conjunction with an adjustable gas block & reduced power buffer spring, you can tune the gas way down, which will reduce muzzle rise and carbon build up.

SAVE on this barrel bundle during our Black Friday Sale! Includes: 16" 308 CMV Barrel, Mid-Length .750 Adjustable Gas Block Mid-Length Stainless Steel Gas Tube .308 Black Nitride BCG SPECS Specs Barrel Extension M4 Weight(s) - Black Friday Categories Upper Parts MPN#: APSL100336

Featuring our new Right To Bear Lightweight carrier, weighing in at approximately 6.8 Ounces, or 194.1 Grams for you lightweight build fanatics! Using our low mass Carrier creates less reciprocating mass moving back and forth inside the action, which reduces recoil significantly. Our lightweight carrier also allows proper cycling with less gas. When used in conjunction with an adjustable gas block & reduced power buffer spring, you can tune the gas way down, which will reduce muzzle rise and carbon build up.

Description Titanium Nitride 5.56 Bolt Carrier Group - Incredibly stunning look, thanks to the bright gold titanium-nitride finish used on the surface of the carrier and bolt. - The carrier is made using 8620 tool steel, while the bolt head is machined from durable 9310 tool steel. - The bolt is magnetic-particle inspected to ensure that consumers get the best-possible components, and the carrier itself is heat-treated for added durability. - Bolt-carrier group weighs 12 ounces. - Designed for use in 5.56 NATO, .223 Rem., .300 Blackout and .204 Ruger AR-15s

Recoil Technologies AR-15 5.56/.223/.300/.350  Complete Bolt Carrier Group Made In The USA

M16 bolt carrier group is the perfect BCG for your next build and is compatible with any AR15 build. The PVD coating by Ionbond provides a very low coefficient of friction while providing a unique look and increased reliability. Properly built, no corners cut. Colors vary, from silvery/gold/rainbow/blue/ish - M16 Style Carrier - Machined from 8620 Steel - Heat Treated - Final Grind Before Plating - PVD Coating by Ionbond - 5.56/.223 Bolt - Machined from 9310 Steel - Heat Treated - Shot Peened - MPI - Blacknitride+™ by H&M - Billet Gas Key

AO Precision Premium Nitride Bolt Carrier Group - HPT/MPI These premium 9310 Bolt carrier groups are manufactured by AO Precision to the highest standards of top tier manufacturers within the industry. AO makes these HPT / MPI BCG's for other Military contractor juggernauts, such as FN America. All bolts are rigorously inspected and are individually High Pressure Tested and then go through a Magnetic Particle Inspection.

Toolcraft Black Nitride Bolt Carrier Group - 158 MPIThis black nitride BCG from Toolcraft is a popular choice for AR-15, M4 and M16 builds due to its mil-spec design and lifetime warranty. The bolt is made from 158 steel while the carrier is made from 8620 tool steel.

Description Right here is a True Mil-Spec BCG. Each and every bolt, test fired from the factory. This unit is for builders who prefer tried and true manufacturing and aggressive quality assurance testing over fancy coatings, proprietary profiles and laser engraved logos. AO Precision has provided BCGs to large military contractors such as FN America and large commercial retailers who re-brand and sell these at a considerable mark-up. You can now get these directly from AR15Discounts.com and save big! Bolt - Machined from Carpenter Technology No. 158 alloy. - Heat treated

Description The NBS .223/5.56 Black Nitride Bolt Carrier Group was designed with strength in mind. Starting with a 9310 Steel Bolt, which is aircraft-grade material, this bolt has a high core strength rating, a high fatigue strength, and a high hardenability rating. 9310 steel, when treated properly, is about 7% better than Carpenter 158 steel, so you know that you will have a dependable BCG, when you drop this into your rifle.

Quick Overview SKU: 516446450 UPC: 516446450 MFR#: 516446450 Nickel Boron Finish Milspec Carpenter No. 158® steel bolt Shot Peened Bolt High pressure tested Mag particle inspected Gas Key Hardened to USGI Specifications Gas Key Grade 8 Hardened Fasteners Gas Key Staked Per Mil-Spec Tool Steel Extractor Extractor Spring Extractor O-ring Insert PSA Logo Nickel boron coated full-auto profile bolt carrier group.  Milspec Carpenter No. 158® steel bolt Shot Peened Bolt High pressure tested Mag particle inspected Gas Key Hardened to USGI Specifications

Known for manufacturing some of the best BCG's that you will find in some of the BIG NAME manufacturers' OEM guns. Rubber City Armory M16 Bolt Carrier Group features a H&M’s Blacknitride+ treatment. Carrier is made from 8620 steel, bolt 9310 steel, billet staked gas key and tool steel extractor/cam pin. Compatible with all AR15 platform systems.  Bolt Finish: Salt Bath Nitride Bolt Material: 9310 Steel Brand: Rubber City Armory Caliber Gauge: 5.56 NATO Carrier Finish: Salt Bath Nitride Carrier Material: 8620 Carpenter Steel Carrier Style: M16 Bolt Carrier

100-022-858WB 5.56 LIGHTWEIGHT 9310 Bolt Carrier Complete Nitride Description Faxon Firearms set out to create a bolt carrier group that could live up to the GUNNER name with no compromise in strength or function. They set specifications that would allow no compromise: - Lightest Weight Possible (8.5 Ounces Complete) - MIL-SPEC Materials & Finishes or Better! - Forward Assist Serrations - Compatible with Dust Covers - Maintains Full-Auto Trip Sear for full-auto and the new multi-stage trigger functionality - Looks Amazing

Description Let’s Go Brandon Engraved BCG This product is a brand new nitride bolt carrier group. Laser engraved with Let’s Go Brandon!! This BCG is ready to drop in! BCG Specs: - Bolt Material: 9310 Steel - Caliber Gauge: 5.56 NATO - Carrier Material: 9310 Steel Carrier - Carrier Style: AR-15 - Magnetic Particle Inspected MPN#: BCG-15-223-00-031

Description This product is a Durkin Tactical Premium 5.56 Nickel Boron BCG (bolt carrier group). This BCG is an eye catching addition to your Durkin Tactical AR build. This BCG has Mil-spec dimensions and coating to ensure the highest quality and correct component interface. PRODUCT SPECS: - .223/5.56 NATO - Nickel Boron finish - M16 cut - 9310 steel carrier - Carpenter 158 steel bolt - 4140 steel extractor - MIL-SPEC O-ring - MIL-SPEC gas rings - 4140 steel cam pin - 8740 steel firing pin with hard chrome finish - Magnetic particle inspected Proudly made in the U.S.A.

Expect nothing less than professional grade weaponry from Bravo Company USA, one of the nation’s largest stocking inventories of AR-15, M4, and M16 parts and accessories. This BCM Bolt Carrier Group features an ion bond finish in flat dark earth for reduced friction and ease of cleaning. Machined to USGI specifications, the carrier has a chrome lined interior and heat treated gas key secured with properly staked grade 8 fasteners.

SKU 5165502109 Brand Lantac Model Number 01-UP-556-TiN-EBCG UPC 711841794064 DETAILS Brand: Lantac Type: Bolt carrier group Caliber: 5.56/.223 Finish: TiN coating FEATURES M16 Full Auto Style for increased mass and lock time. Our new TiN E-BCG is precision machined from 8620 Steel with a shot-peened bolt manufactured from Carpenter 158 and Magnetically Particle Inspected. The entire carrier assembly is TiN, Titanium Nitride coated.

SKU: 5165449729 UPC: 5165449729 MFR#: 5165449729 Nickel Boron Finish Milspec Carpenter No. 158® steel bolt Shot Peened Bolt High pressure tested Mag particle inspected Gas Key Hardened to USGI Specifications Gas Key Grade 8 Hardened Fasteners Gas Key Staked Per Mil-Spec Tool Steel Extractor Extractor Spring Extractor O-ring Insert ToolCraft Logo PA-15 Engraving ToolCraft Premium Carpenter 158 BCG with Nickel Boron coated finish.  BCG has the ToolCraft Logo and PA-15 engraved on to the side of the BCG. SKU: 5165449729 UPC#: 005165449729

SAVE on this barrel bundle during our Black Friday Sale! Includes: 10" 300 Blackout CMV Barrel, Pistol Length .750 Adjustable Gas Block Pistol Length Gas Tube 5.56 Black Nitride BCG SPECS Specs Barrel Extension M4 Weight(s) - Black Friday Categories Upper Parts MPN#: APSL100334

This high quality bolt carrier group is a valuable addition to your AR15 build. Features: No Aero 'A' Logo M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Black Nitride Finish - advanced lower friction coating that minimizes the need for lubricants and cleaning Properly staked gas key Shot peened HPT tested Black o-ring insert on extractor High quality BCG SPECS Specs Made In America? Yes Select Your Finish Black Nitride Platform AR15 Bolt Material 9310 Steel Carrier Material 8620 Steel

The Precision Defense 5.56 M16 Complete Bolt Carrier Group is machined from high-quality materials to ensure your AR-15 will run reliably as long as you have ammo to shoot it with. The carrier body is machined from 8620 steel and finished in black Nitride for its slick and durable qualities making it run extremely smooth in your receiver. It features an M16 cut allowing it to be full auto rated and the extra weight helps to reduce bolt bounce.

This Aero Precision .308 Complete Black Nitride Bolt Carrier Group is ideal for your big-bore rifle build. These Bolt Carrier Groups from Aero Precision are MPI/HPT inspected and bear a laser engraved Aero Precision logo. The carrier of the Aero Precision .308/7.72 Complete BCG is machined from 8620 steel and then case hardened. All parts of the Aero Precision Complete .308/7.72 Bolt Carrier Group are black nitride coated to reduce friction during use and ensure long-lasting reliable performance. Specifications for Aero Precision .308 Black Nitride BCG: Fabric/Material: 4130 Stee

The Radical Firearms 5.56 NATO / 300 BLK Gen 2 Bolt Carrier Group features an M16 pattern 8620 tool steel carrier with 9310 alloy steel bolt and shot-peened for increased surface strength and durability. Each bolt is equipped with an extractor booster to ensure reliable cycling during rapid semi-auto or full-auto fire. A properly staked gas key prevents gas leakage that can lead to short stroking. Each assembly is magnetic particle inspected to ensure it is free from defects that can lead to premature failures.

Right To Bear Dedicated 22 LR Stainless Steel Bolt GroupGreat for any .22LR enthusiast. This Right To Bear Bolt Group was developed to provide a long lasting and reliable bolt group that is compatible with all CMMG and RTB .22 AR barrelsDesigned to work with all CMMG and RTB .22LR barrelsStainless Steel ConstructionPlease note: These .22 BCG's are test fired and may have light carbon fouling MPN#: RTB-22BA487

The Aero Precision PRO 5.56 AR-15 Bolt Carrier Group is a high-quality addition to your existing rifle or as the building block for your next AR build project. Aero has manufactured the PRO Bolt Carrier Group with purpose and has designed it with components to increase durability. The bolt is heat treated and machined from 9310 steel.

Aero Precision upgraded nickel boron bolt carrier group helps you to build a custom AR-15 from the ground up. Mil-Spec dimensions and Nickel Boron coating ensure the highest quality and correct component function as well as reliability. SPECIFICATIONS Bolt FinishNickel Boron Bolt Material9310 Steel BrandAero Precision Caliber Gauge5.56 NATO Carrier FinishNickel Boron Carrier Material8620 Tool Steel Carrier StyleM16 / Full Auto Gas KeyStaked High Pressure TestedNo Magnetic Particle InspectYes ManufacturerAero Precision PlatformAR-15

The Aero Precision .308 Black Nitride Bolt Carrier Group is a substantial upgrade from a standard BGC. The nitride finish reduces friction, minimizes the need for lubricants and cleaning, and provides excellent corrosion resistance. MIL-SPEC dimensions ensure correct component function and reliability. Multi-caliber bolt designed to function with .308 Win, 7.62x51, 6.5 Creedmoor, .338 Federal and other .308 based cartridges. Features: - Machined from case hardened 8620 steel (carrier) case hardened 9310 steel (bolt) - Laser engraved Aero Precision "A" logo

The Aero Precision 5.56 Bolt Carrier Group for AR-15 rifles is made from high quality materials with quality assurance measures like high pressure testing and magnetic particle inspecting. The bolt assembly is machined from 9310 steel and tested to ensure it can withstand thousands of high-pressure rounds. The Carrier assembly is machined from 8620 steel and the entire BCG is magnetic particle inspected to ensure every dimension is as precise at can be. The black Nitride finish increases hardness and creates an extremely smooth surface for ease of cleaning and improved reliability.

This 7.62x39 Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil-spec upper receivers chambered in 7.62x39. All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both wear and corrosion resistance. EXO Nickel Boron makes for easy cleanup even with the corrosive 7.62x39 ammo and will improve the performance of your rifle. The bolt keeps the Mil-Spec length for a more reliable bolt.

AR10 DPMS Pattern BCG - .308 Bolt Carrier Group - Black NitrideThis Black Nitride .308 Complete BCG is compatible with any AR10, .308 or 7.62x51 rifle that follows the DPMS pattern. The carrier includes forward assist serrations and the bolt is (MPI) certified. Bolt:MPI Inspected9310 Alloy Steel Hardened Steel ExtractorMilspec Gas rings (3)Black Extractor Insert2 Viton O-Rings Bolt Carrier:8620 SteelHeavy Duty Full Cut DesignGrade 8 Gas Key Screws, StakedGas Key Material - 4140Cam Pin:8620 Steel Nitride FinishFiring Pin:Mil-Spec Firing Pin MPN#: DPP-308-SBN

Description This high quality bolt carrier group is a valuable addition to your AR15 build. Features: M16-cut carrier Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) Carrier has forward assist serrations Black Nitride Finish - advanced lower friction coating that minimizes the need for lubricants and cleaning Properly staked gas key Shot peened HPT tested/MPI marked Black o-ring insert on extractor High quality BCG

Description Our upgraded nickel boron bolt carrier group is an eye catching addition to your AR build. Mil-spec dimensions and coating ensure the highest quality and correct component interface. Features: - Machined from 8620 Tool Steel (Carrier) and 9310 Steel (Bolt) - Carrier has forward assist serrations - Shrouded firing pin - Nickel Boron Coating inside and out (Bolt, Carrier, and Gas Key) - Forged Mil-Spec gas key attached with Grade 8 hardware and Properly staked. - 5.56 Bolt is shot Peened and MPI

Description

FailZero M16/Full Mass Nickel Boron EXO Black BCG If you're looking for a tactical advantage in your shooting, this FailZero black-coated bolt carrier group is a great choice. It features the company's EXO Nickel Boron coating over all critical components and then all parts are coated in black for a non-reflective advantage. However, areas prone to wear will eventually lose their topcoat (read below for more information). FailZero's patented Nickel Boron coating is ideal for longevity and performance.

Upgrade your rifle with this high-quality American Built Arms Company Pro 5.56 Bolt Carrier, Nickel Boron, Mil-Spec. This item only includes a bolt carrier; it is not a complete bolt carrier group. American Built Arms Company built these Bolt Carrier Groups from rugged 8620 steel in an M-16 style that functions better in semi-auto or fully-automatic rifles. The American Built Arms Company Pro Mil-Spec 5.56x45mm NATO Bolt Carrier also includes a 4130 steel gas key with screws for installation.

If you are looking to build an AR-15 for hard use, to standards that exceed Mil-Spec expectations, then look no further than Sons of Liberty Gun Works. Every component of this bolt carrier group has been properly heat treated and is designed for reliability and longevity. The carrier is machined from AISI 8620 aircraft quality steel and features a full auto profile with durable manganese phosphate coating. The bolt is made from Carpenter Technology No. 158 Alloy and has been magnetic particle inspected as well as high pressure tested to ensure that it will run for many years to come.

The best BCGs for replacement parts and builds have strong and dependable carriers with trusty bolt assemblies that cycle reliably. That's exactly what you'll get with this high quality complete BCG. This TiN Plated BCG comes with a Gold finish. This Titanium Nitride Bolt Carrier Group is perfect for any AR15, M4 or M16 Build. These carriers and bolts are build to military specifications, also known as "Mil-Spec" and they are known throughout the industry as some of the best! Enhanced 9310 Steel (Bolt) 8620 Tool Steel (Carrier)

The AB Arms PRO Advanced Rifle Bolt Carrier Group is specially made to have exacting tolerances and surface finishes and built to Mil-Spec dimensions. These Bolt Carrier Groups by American Built Arms Company are built of 8620 steel and coated in Nickel Boron with a Nickel Boron coated bore, so you'll need nearly no lubrication. The extractor of the American Built Arms Co PRO 5.56 BCG is made from aircraft grade E4140 steel, and is coated in manganese phosphate to provide superior extraction during each fire.

Manufacturer: Palmetto State Armory Product Line: PA-15 Platform: AR-15 Caliber: 5.56/.223 Finish: Nickel Boron Coating Bolt Steel: Milspec Carpenter No. 158 Bolt: Shot Peened Mag Particle Inspected: Yes ** These BCG's will have cosmetic blemishes that do not affect function. This may include but is not limited to, scratches and slight variation in the finish color coat. FEATURES

IMI Defense AR-15 5.56/.223/.300/.350 Full Auto Nitride Bolt Carrier Group IMI Defense is also an innovator in the field of accurate training, offering LE and military units the MTR16 Modular Training Rifle system which is a highly realistic inert M16/AR15 mockup that lets users change out all accessories including buttstocks, grips, sights, and more while accepting standard magazines as well. The line also includes training rifles replicating the AK-47/AKM and AK74 weapons platforms.

Feature rich, high-quality, and affordable, Foxtrot Mike Products offer cutting edge solutions utilizing the highest quality materials and manufacturing processes available. This Premium 9mm Bolt Carrier Assembly is compatible with all GLOCK style AR builds. Maintaining a harder core than standard 8620 steel, this carrier is machined from 8620H. OD ground prior to machining in a pre-hardened state for improved tolerances post machining and coating. A long duration salt bath nitride finish is applied for a long service life and superior corrosion resistance.

United Defense AR-15 5.56/.223 Complete Bolt Carrier Group The Bolt Carrier Group (BCG) is the heart of your AR-15. This United Defense BCG is made of 9310 steel then Nitride finished at the world class facility H&M then MPI and HPT inspected for extreme safety to ensure your AR-15 will run reliably as long as you have ammo to shoot it with. This is one of the highest quality BCGs made. SPECIFICATIONS: BCG Brand: United Defense BCG Caliber: 5.56 / .223 / 300 Blk / .350 Legend BCG Bolt Head Finish: Nitride BCG Bolt Head Material: 9310 Alloy Steel BCG Carrier Finish: Nitride

This Toolcraft 308 / AR-10 / 6.5 Creedmoor DLC BCG is trusted by weapons manufacturers and custom rifle builders around the world. Now you too can get this outstanding BCG at a fraction of the cost.

some parts you want for that 7.62×39 ar build. Nickel Boron 7.62×39 Bolt Enhanced / extended firing pin for those difficult primers heavy hammer spring for those difficult primers

RF 223/5.56/ 300AAC / 22Nosler M16 Carrier ( Melonite ) Specifications for Radical Firearms RF 223/5.56/300AAC/22Nosler M16 BCG, Melonite Bolt Carrier Group: Color: Black Finish: Melonite Caliber: 5.56x45mm NATO

078-102-001WB M16 Bolt Carrier Group 5.56x45mm Nitride MP Cartridge: 5.56 mm NATO Finish: Black Nitride Description Specs Reliability for the Discerning Operator The Brownells M16 5.56 Complete Bolt Carrier Group is designed to work easily and reliably in any AR-15 or M16 rifle chambered in 5.56x45mm, 300 AAC Blackout or .223 Remington.

The Ideal Big-Bore Bolt Carrier Group The Brownells Complete .308 Bolt Carrier Group is designed to operate in all AR-10-pattern guns, allowing for a simple drop-in component to complete any .308 Win.-caliber upper. The Brownells Complete .308 Bolt Carrier Group is constructed using a bolt machined from 9310 steel, which is finished with a heat treatment and shot peening. The carrier itself is fabricated from hardened 8620 steel. - Each BCG is quality-checked with magnetic particle inspection - Extractor is installed with rubber insert and spring

078-000-710WB BRN-4 416 TYPE COMPLETE BCG NITRIDE Cartridge: 5.56 mm NATO Finish: Black Nitride BRN-4 Complete Bolt Carrier Group for 416 Type Firearms This Completely assembled BRN-4 Bolt Carrier Group is ready to drop into HK® 416, MR556 or other compatible upper receivers & firearms. Utilizing high quality materials, finishes and inspection criteria, this BCG provides great value as a replacement or build component.