Bolt Carriers Gun Parts

(729 deals total)

This high quality bolt carrier group is a valuable addition to your AR15 build. Specifications for Aero Precision AR15 5.56 Bolt Carrier Group: Color: Black Fabric/Material: 8620 Steel Caliber: 5.56x45mm NATO Gun Model: AR-15 29D-BCG-VT72L-APRH100399C UPC#: 840014606238

When you're building your AR-15, the most crucial part is the bolt carrier assembly, and the Wilson Combat AR-15 Bolt Carrier Group BCG is a perfect choice! The Wilson Combat Bolt Carrier Assembly comes in several different finishes depending on your shooting needs: nickel boron, black nitride, and parkerized. Nickel boron offers resistance against corrosion and increases lubricity, which makes the bolt carrier easier to clean. Parkerized Bolt Carrier Groups have a manganese phosphate coating that increases the thickness of the bolt carrier.

Our Nitrided M16 BCG is micro polished before and after the Melonite process, producing a beautiful finish and an extremely slick surface. The carrier is made from 8620 steel. The bolt is made from 9310 steel and is MPI Tested and engraved. The 223 Bolt and Bolt Carrier Assembly is compatible with 5.56 and 300 Blackout. Features: Enhanced 9310 Steel (Bolt) 8620 Tool Steel (Carrier) Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring Tool Steel Extractor Shrouded Firing Pin Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and Properly staked

The Battle Arms Development Bolt Carrier Group features an M16 cut profile which is heavier than an AR-15 cut profile to prevent bolt bounce and slow down the cyclic rate for a more controllable and reliable rifle. The 5.56 bolt is machined from 9310 steel, case hardened, and then shot peened to increase durability and ensure that it will survive thousands of rounds of high-pressure military surplus ammunition. An important component of an AR-15 BCG that is often overlooked is the cam pin.

AR-15 5.45x39 COMPLETE BOLT CARRIER GROUP / NITRIDEAR-15  5.45x39 COMPLETE BOLT CARRIER GROUP / NITRIDECALIBER: 5.45X39MPI inspectedM16 STYLE NITRIDE COATED 8620 STEEL CARRIER9301 STEEL HEADENHANCED FIRING PIN, CHROME PLATEDCAM PINCHROME LINED GAS KEYCOMES COMPLETELY ASSEMBLED WITH PROPERLY STAKED GAS KEYImages may not be an exact representation of the product. MPN#: 5.45-BCG

 The Spike's Tactical 9mm bolt is AR-15 blowback complete bolt. Crafted from 416 stainless steel and features a matte black finish. Features: - 9mm Luger bolt - 416 stainless steel - Grade 8 screws - Black finish     Back Specifications Brand: Spike's Tactical Caliber Gauge: 9mm Luger Platform: AR-15 MPN#: ST9BG01

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

Recoil Technologies AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group Made of 9310 steel then Nitride finished at the world-class facility H&M then MPI and HPT inspected for extreme safety. This is one of the highest quality BCGs made. FEATURES: Durability Lubricity Corrosive Resistance Carbon Resistance Extreme Metal hardness 85-90 Rockwell SPECIFICATIONS: Brand: Recoil Technologies Caliber: 5.56 / .223 / 300 Blk / .350 Legend Bolt Head Finish: Nitride Bolt Head Material: 9310 Alloy Steel Carrier Finish: Nitride Magnetic Particle Inspect (MPI): Yes

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.

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.

M16-cut carrier Machined from 8620 steel Carrier has forward assist serrations Black Nitride Finish – advanced lower friction coating that minimizes the need for lubricants and cleaning Properly staked gas key 5.56 Bolt is machined from Carpenter 158 tool steel Shot peened HPT tested/MPI marked Black o-ring insert on extractor High quality BCG MPN#: 1677

Founded in January 2014, Cryptic Coatings specializes in bolt carrier groups and BCG coatings. With an ever-expanding product line, their BCGs and coatings offer reduced friction, longer lifespans, and increased performance, backed by their lifetime warranty.

Premiere Manufacturing Complete AR15 BCG - Polished Black Nitride + 16" 300 BLK Barrel Barrel Specs:This 16 inch Pistol Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish.

SPECIFICATIONS: Brand: Mercury Precision Platform: LR-308 / AR-10 Caliber Compatibility: .308 Win, 7.62 NATO, 6.5 Creedmoor, .243 Win Bolt Head Material: 9310 Alloy Steel Bolt Head Finish: Nickel Boron Body Material: 8620 Alloy Steel Body Finish: Nickel Boron Style: Standard Gas System: Direct Impingement Forward Assist Cuts: Yes Full Auto Compatible: Yes Want to see more deals from Omega Tactical Distribution?Subscribe to get deals straight to your inbox.

Recoil Technologies AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group*Made In The USA*About this BCG: The bolt carrier group or BCG as is commonly referred, is the heart of the AR-15, and with that vital function, you want to have a unit that won't fail you, and will provide function after function, time after time, round after round. The Recoil Technologies is produced with 8620 Steel for its body, allowing for a nitride finish to adhere and create a tough, durable surface that won't get chewed up in the standard wear and tear that this BCG should go through.

Mercury Precision AR 9mm Complete Bolt Carrier Group *Accepts Glock and Colt Magazines* LIMIT 2 PER ORDER

Starting with a full mass, M16-profile carrier, you won't have to suffer through any additional tuning wizardry to make your rifle work. The gas key is extruded from Mil-Spec 4130 alloy, sealed to the carrier, and fastened with staked Grade-8 fasteners. Our cam pin is machined from 4340 alloy and engraved with a "FORWARD" directional marking for consistent installation direction and wear for improved longevity. The firing pin is machined from 8740 alloy, properly heat-treated, and hard-chrome plated. Moving forward to the bolt assembly, the bolt head is machined from Mil-Spec Carpenter No.

The RISE Armament Rifle Bolt-Carrier Group ensures the highest level of performance out of your favorite rifle. These Bolt Carrier Groups by RISE Armament reduce friction and increase the smoothness of each shot with high quality steel parts, a heat treated carrier, and a grade 8 hardened gas key. The RISE Armament AR-15/M-16 BCG is individually MPI tested for quality so you can be confident you're getting overall improved performance. Choose the RISE Armament Advanced Bolt Carrier Group for a great new addition to your rifle.

Our Nitrided M16 BCG is micro polished before and after the Melonite process, producing a beautiful finish and an extremely slick surface. The carrier is made from 8620 steel. The bolt is made from 9310 steel and is MPI Tested and engraved. The 223 Bolt and Bolt Carrier Assembly is compatible with 5.56 and 300 Blackout. Enhanced 9310 Steel (Bolt) 8620 Tool Steel (Carrier) Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring Tool Steel Extractor Shrouded Firing Pin Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and Properly staked

FailZero LR-308 BCG Nickel Boron This .308 WIN Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most Mil-Spec upper receivers chambered in .308 WIN. 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 and will improve the performance of your rifle.

Both items must be in cart for discount to apply. Limit One Free Item Per Order. No code needed. Cannot combine with other discounts. AR15/M4 5.56 Charging Handle LINK This contract overrun 5.56 BCG is a no-frills nickel boron bolt carrier group that ships without customer packaging. These BCGs feature a satin NiB finish and utilize C158 carpenter steel for the bolt material. FEATURES: M16 Cut Carrier Staked Gas Key Forward Assist Serrations C158 Bolt O-Ring Extractor Insert Nickel Boron Finish

Carrier Type : M16 Cartridge : 5.56x45 NATO Color : Gold Finish : TiN PVD Make Model Fit : AR-15.Universal Brownells sku: 078000410 MPN#: M16 5.56 BCG TITANIUM NITRIDE UPC#: 050806112483

Model Number : W/ Serrations Carrier Type : M16 Brownells sku: 078000375 MPN#: M16 CHROME BOLT CARRIER GROUP UPC#: 050806112407 Classic Retro Chrome M16 Bolt Carrier Groups match the finish of the bolt found on the earliest AR-15 & M16 rifles introduced.

The Geissele Automatics Reliability Enhancement kit comes with the enhanced 5.56 BCG, Super 42 braided buffer spring, and H2 buffer weight. The Enhanced Bolt Carrier Group is a full mass M16 profile full auto rated BCG built out of premium materials and coatings for long term durability and reliability. The carrier is machined from 8620 steel and the cam pin is machined from H13 steel. The entire AR-15 Bolt Carrier Group is coated in Nanoweapon which is a Chrome-Nitride finish that increases smoothness and surface hardness for corrosion resistance and cleaning.

Description The Toolcraft .223/5.56/300 BLK M16 Profile Bolt Carrier Group – Ion Bond DLC is the same BCG that is trusted by countless manufacturers around the world but enhanced with an Ion Bond Diamond Like Coating. DLC is quickly becoming one of the most desirable finishes for critical weapon components for the following reasons: - Hardness (Rockwell) – Greater hardness rating compared to unpolished Nickel Boron (90RC vs 82RC) - Coefficient of Friction – Lower coefficient of friction compared to Nickel Boron (.15 vs .5-.8)

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

SPECIFICATIONS: Brand: Recoil Technologies Model: .45 ACP Bolt Carrier Group Caliber Compatibility: .45 ACP Platform: AR-15 Bolt Head Material: 9310 Alloy Steel Bolt Head Finish: Nitride Body Material: 8620 Alloy Steel Body Finish: Nitride Style: Pistol Caliber Looking for a Coupon Code?! Use the Current Month and Year (ie: august2023) at checkout to save on your next order Cannot Be Combined With Any Other Promotion Or Coupon Code Did you Know That We Offer FREE Printable Range Targets

Manufactured to be a superb item for almost any individual, we are positive you are going to enjoy the Radical Firearms 458 SOCOM M16 Melonite Bolt Carrier Group .These Bolt Carrier Groups through the expert product specialists at Radical Firearms are fashioned by using long lasting and efficient components, in order to provide you with product that will be beneficial for a long time.

Self-Lubricating Surface Treatment Provides Smooth, Reliable Function

Recoil Technologies PCC AR Bolt Assembly for 10mm/.40 S&W SPECIFICATIONS: Brand: Recoil Technologies Model: 10mm Bolt Carrier Group Caliber Compatibility: 10mm Platform: AR-15 Bolt Head Material: 9310 Alloy Steel Bolt Head Finish: Nitride Body Material: 8620 Alloy Steel Body Finish: Nitride Style: Pistol Caliber Gas System: Pistol Caliber Gas Key Forward Assist Machining: No Full Auto Compatible: Yes

Use code: USA15 for this price. Free shipping on all orders! Unlock unmatched AR performance with LANTAC's E-BCG® Enhanced Bolt Carrier Group. Every element, from its construction to its features, is geared toward providing an unmatched shooting experience, ensuring your AR functions at its peak potential. Key Features: Innovative Design: Built for M16 full auto style, the E-BCG® offers increased mass, ensuring better lock time and more efficient cycling.

Add a high-quality bolt carrier group to your next .308 build with Spike's Tactical .308 BCG. This DPMS-style bolt carrier group has been magnetic particle inspected, and high-pressure tested to ensure quality and reliability. The full auto carrier is made from 8620 tool steel with a chrome interior, and the shot-peened bolt is crafted from 9310 tool steel. The gas key has been properly staked, and all surfaces are phosphate coated to resist corrosion. An engraved Spike's Tactical Spider Logo is located on the right side of the carrier to show through the ejection port.

The Geissele Automatics Reliability Enhancement kit comes with the enhanced 5.56 BCG, Super 42 braided buffer spring, and H1 buffer weight. The Enhanced Bolt Carrier Group is a full mass M16 profile full auto rated BCG built out of premium materials and coatings for long term durability and reliability. The carrier is machined from 8620 steel and the cam pin is machined from H13 steel. The entire AR-15 Bolt Carrier Group is coated in Nanoweapon which is a Chrome-Nitride finish that increases smoothness and surface hardness for corrosion resistance and cleaning.

Daniel Defense complete chrome plated, semi-auto bolt carrier group assembly. This AR-15 Bolt Carrier Group features a shot-peened bolt with extractor booster. The Bolt Carriers are MPI tested, chrome lined, and have properly staked gas keys. Back Specifications Bolt Finish: Manganese Phosphate Bolt Material: Carpenter 158 Steel Brand: Daniel Defense Caliber Gauge: .224 Valkyrie Carrier Finish: Manganese Phosphate Carrier Material: 8620 Carpenter Steel Carrier Style: M16 Bolt Carrier High Pressure Tested: Untested Magnetic Particle Inspect: Magnetic Particle Inspected

Description MANUFACTURER’S DESCRIPTION We just can’t help not accepting the status quo. Bolt carrier groups are available aplenty, but few could meet our exacting standards for performance and value. Seeing “MIL-SPEC” as just the starting point, we set out to ensure the best options are available for our demanding customers.

The Noveske Rifleworks 5.56 M16 Bolt Carrier Group is a great option for building an AR-15 with reliability and ease of maintenance in mind. This BCG features the popular black Nitriding finish process that utilizes thermal chemical diffusion of Nitrogen and Carbon into the surface of the metal to physically change the properties. This process increases wear resistance, strength, corrosion resistance, and lubricity.

Founded in January 2014, Cryptic Coatings specializes in bolt carrier groups and BCG coatings. With an ever-expanding product line, their BCGs and coatings offer reduced friction, longer lifespans, and increased performance, backed by their lifetime warranty.

Description

When you're building your AR-15, the most crucial part is the bolt carrier assembly, and the Wilson Combat AR-15 Bolt Carrier Group is a perfect choice! The Wilson Combat Bolt Carrier Assembly comes in several different finishes depending on your shooting needs: nickel boron, black nitride, and parkerized. Nickel boron offers resistance against corrosion and increases lubricity, which makes the bolt carrier easier to clean. Parkerized Bolt Carrier Groups have a manganese phosphate coating that increases the thickness of the bolt carrier.

Description This NBS Black Nitride .308 Complete BCG is compatible with any AR10, 6.5 Creedmoor, .308 or 7.62×51 rifle that follows the DPMS pattern. The carrier includes forward assist serrations and the bolt is (MPI) certified. The double ejectors address the problems most rifle builders encounter with AR10 variant calibers, and with the addition of a second ejector, you can expect flat loading, powerful and consistent ejection. Bolt: - MPI Inspected - 9310 Alloy Steel - Hardened Steel Extractor - Double Ejector - Milspec Gas rings (3) - Black Extractor Insert Bolt Carrier:

Carrier Specifications Bolt: LEFT HAND, Shot Peened Material: 8620 Steel Type: M16 Full Auto Gas Key Material: 4130 Steel Grade 8 Gas Key Screws Coating: Black Nitride Bolt Specifications Bolt Material: 9310 Steel | Shot Peened Extractor Material: 4140 Steel Caliber: 7.62x39 Mil-Spec O-Ring Mil-Spec Gas Rings (3) Cam Pin Material: 4140 Steel Firing Pin Material: 8740 Steel, Hard Chrome Plated Other: MPI Inspected MADE IN THE USA

The Toolcraft 5.56×45 NATO/.223 Rem (or .300 Blackout) Bolt Carrier Group comes in the Nickel Boron finish to reduce overall wear and friction, and for upgrading your existing AR build. These Full Auto M16 Profile Direct Impingement BCG designs have multiple features that separate them from the average AR Bolt Carrier Group. They are Magnetic Particle Inspected for Quality Control, and built to Mil-Spec standards throughout.

Accessorize Your Build: United Defense LR-308 "Holy" Ambidextrous Charging Handle - Silver The Charging Handle on the DPMS LR-308 / AR-10 rifle is a simple latching design that indexes with the gas key on your bolt carrier group, this allows you to charge your rifle, eject and feed rounds manually. FailZero .308 Win Bolt Carrier Group

Not just another Bolt Carrier Group the 5.56 M16 BCG from Angstadt Arms is a must have for the demanding shooter or operator who’s looking for crisp performance and durability.  Manufactured to stringent specifications and milled from 8620 alloy steel, the Angstadt Arms Bolt Carrier Group has that look, a sleek black Nitride finish which implies stellar performance even before it makes its way into the action system of your AR-15. Features: - 8620 Alloy Steel carrier - Carpenter 158 bolt - HPT and MPI - Shot peened - Properly staked grade 8 fasteners - Black Nitride

M-SPEC is a range of AR15 accessories and components that follow the military specification in dimensions, tolerances and materials with the addition of a few upgrades and enhancements to raise the performance standard of the product above the ‘milspec’ rating, while retaining the same economical price point as traditionally offered by other providers.

The Aero Precision Bolt Carrier Group is a high-quality addition to your AR-15 build. Finished with durable MIL-SPEC manganese phosphate with chrome lined internal and gas key. 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. MIL-SPEC dimensions ensure correct component function and reliability. Features: - Laser engraved Aero Precision "A" logo - Machined from 8620 tool steel (carrier) and carpenter 158 steel (bolt)

DETAILS Manufacturer: Toolcraft Caliber: 5.56/.223 Bolt Finish: Nitride Bolt Steel: Carpenter No. 158 Steel Profile: Full Auto Profile Gas Key: Grade 8 Hardened Fasteners, Staked per MilSpec FEATURES This Toolcraft Nitride BCG is made with a carpenter 158 bolt with a full-auto profile, designed to be used in AR-15 & M-16 style rifles. Bolt is magnetic particle inspected for a uniform quality and operational reliability. 516446915B

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

Each of Mil-Spec Bolt Carrier Group Assemblies feature full-auto capability, a shot peened MPI Bolt, 8620 Gas Carrier and Gas Key fastened with hardened Grade 8 fasteners. Specifications for Tiger Rock AR-15 Bolt Carrier Group Assembly: Fabric/Material: Heat Treated Steel Caliber: 5.56x45mm NATO, .223 Remington Gun Make: AR Platform Gun Model: M16, AR-15 Condition: New 4LJ-BCG-BCGBN-BCG-N UPC#: 815757023406

Description When it’s time to upgrade your AR-10 or build yourself a new precision platform, the Aero Precision .308 / 7.62 Bolt Carrier Group is a stellar choice. It matches other top-of-the-line .308 BCGs feature for feature and and is built to last. Aero Precision is a well-known company with a solid reputation for quality. Features:

Recoil Technologies AR-15 5.56/.223/.300/.350 Nitride MPI Tested Full-Auto Bolt Carrier Group SPECIFICATIONS: Brand: Recoil Technologies Caliber: 5.56 / .223 / 300 Blk / .350 Legend Bolt Head Finish: Nitride Bolt Head Material: 9310 Alloy Steel Carrier Finish: Nitride Magnetic Particle Inspect (MPI): Yes Platform: AR-15 Forward Assist Notches: Yes Style: Standard Color: Black Full Auto Compatible: Yes Looking for a Coupon Code?! Use the Current Month and Year (ie: august2023) at checkout to save on your next order

CMMG Radial Delayed Blowback .45 ACP BCG and 8" Barrel ComboCMMG's patented Delayed Blowback 45 ACP system substantially reduces recoil compared to standard blowback .45 ACP builds. Now you can build your own CMMG Delayed Blowback SBR 45 ACP rifle or pistol.Our MkG Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using our Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG.

SKU: 3605

.458 SOCOM Complete Bolt and Carrier Group Black Nitride coated Chrome Lined Carrier is 8620 steel Bolt is 9310 steel MPI Tested The .458 SOCOM Bolt and Bolt Carrier Assembly comes complete with Cam Pin, Firing Pin and Firing Pin Retainer. SKU: 458SOCOM-SBN-BCG UPC: 860006522040

Bolt carrier, Machined from S7 Tool Steel, Lithium Isonite Coating, 4 Setting Adjustable Vent System relieves excess gas pressure created from suppressor use creating longer dwell time and less blowback to the shooter. Gas Adjustment can be turned while installed in the rifle, Staked MIL-SPEC Gas Key, Adjustment Pin is easily removed for cleaning. This carrier does not come complete. This follows the DPMS Gen 1 Pattern for the AR-10 design. The AR-10 does not have MIL-SPEC sizing

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

This second version AR-15 bolt carrier group from Alpha Shooting Sports features significant refinements such as smoother bearing surfaces and an improved AR15 extractor system. Alpha Shooting Sports also engineers the BCG V2 with improved carrier geometrics representing the ultimate in bolt carrier groups for an AR-15 platform semi-automatic rifle. The bolt of the carrier group is machined from 9310 steel and MPI tested and marked, while the carrier itself is machined from 8620 steel featuring an extractor machined from S7 tool steel. Features: - Bolt Material: 9130 Steel

Our Nickel Boron Bolt Carrier Group is specifically coated to allow your rifle to operate smoothly, be easily maintained, and work longer without being cleaned. We offer a 100% money back guarantee. With top quality companies that we utilize to plate our BCG's such as the UCT EXO Nickel Boron bolt carrier group, and WMD bolt carrier group, we are confident that each component that the BCG is made of will successfully work on any quality AR15 rifle.

9mm bolt carrier group compatible for use with both GLOCK® and Colt® style 9mm AR-15 magazines without any further modifications. Machined from 8620 alloy steel with a QPQ black nitride finish Compatible with both GLOCK® and Colt® 9mm AR-15 magazines For use with a standard AR-15 hammer Features removable weight for use with Law Tactical folding stock adapter SKU: AA09BCGNIT

The heart of a reliable AR-15 build is a quality 5.56 bolt carrier group assembly. These are the same high quality BCG’s we make for law enforcement and military groups around the world. Machined to mil-spec dimensions and finished in a beautiful black nitride finish, this bolt will continue to run and looks great doing so. Specifications: Machined from 8620 alloy steel with a QPQ black nitride finish 5.56 Bolt is machined from Carpenter 158 tool steel High pressure tested (HPT) and magnetic particle inspected (MPI) Shot peened M16-cut/full auto capable carrier