Bolt Carriers Gun Parts

(715 deals total)

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.

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols. Feature rich, high-quality, and affordable, Foxtrot Mike Products offer cutting edge solutions utilizing the highest quality materials and manufacturing processes available.

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

FosTech Outdoors AR-15 Complete Bolt Carrier Groups. This is a standard full-auto M16 cut Nickel Boron Bolt Carrier Group. It is designed to function with the Echo AR-II and the Echo Sport. Specifications for FosTech Outdoors AR-15 Complete Bolt Carrier Group: Gun Model: AR-15 3FS-BCG-CBCG-FT-BCG MPN#: 6226 UPC#: 639266299677

- Enhanced profile reduces tilt - DPMS pattern - Forward facing gas vents - 8620 steel carrier - Chrome lined gas key - Carpenter 158 Bolt - Shot peened and MPI - Black Nitride finish - Polished domed cam pin - Lifetime warranty - Made in the U.S.A.

Brownells # 078102007 MFR # M16 BCG 458 SOCOM / 450 BM NIT UPC 508061123152 Get your .458 SOCOM or 450 Bushmaster AR-15 running perfectly with the Brownells M16 .458 SOCOM/450 Bushmaster Bolt Carrier Group, which features construction and finishing designed to provide the best possible performance in your rifle. The Brownells M16 .458 SOCOM/450 Bushmaster Bolt Carrier Group features a bolt head built using 9310 steel, which undergoes heat treatment and shot peening for a durable finish. The carrier itself is made using 8620 steel that undergoes hardening after machining.

RF 7.62x39 M16 Carrier( Melonite ) Specifications for Radical Firearms RF 7.62x39 M16 BCG, Melonite Bolt Carrier Group: Color: Black Finish: Melonite Caliber: 7.62x39mm

This Aero Precision 5.56 Complete Bolt Carrier Group is coated inside and out with Nickel Boron for smooth action and an eye catching aesthetic. These Bolt Carrier Groups from Aero Precision are shot peened and Magnetic Particle Inspected so you can count on their durability. The highly machined finish of these affordable Aero Precision Complete AR15 BCGs makes them easier to clean because it's easier to see fouling or residue from cleaning agents. Upgrade your AR15 with the Aero Precision 5.56 Mil-Spec Bolt Carrier Group.

In building or upgrading an AR platform rifle, the bolt carrier group is the rifle's foundation. A quality BCG is what will make a firearm work reliably. If you're looking to upgrade the bolt in your AR, consider the Aero Precision 6.5 Grendel Bolt Carrier Group in Black Nitride.These are seriously superior bolt carrier groups. Made from 8620 steel, the M16 cut bolt carriers are sure to last a long time. Because they are treated in a black nitride finish, the carrier won't need as much cleaning or lubrication as untreated bolts.

3734 The Enhanced Bolt Carrier Group for AR15/M16 platform weapons was designed to minimize carrier tilt and reduce friction inside the upper receiver by relocating key bearing surfaces. All materials, tolerances, and coatings meet or exceed milspec standards for performance, reliability, and durability. Type: 223/5.56 NATO AR15/M16 (full auto) Bolt: Case hardened 9310 steel, shot peened w/ black nitride finish Carrier: Billet machined case hardened 8620 steel w/ black nitride finish Gas Key: 4130 steel, attached using Grade 8 hardware and proper staking techniques Weight: 11.4 oz

FAXON GUNNER LIGHT WEIGHT BOLT CARRIER GROUP - COMPLETE - NITRIDEWhen looking at lightweight bolt carrier groups, we were unsatisfied with what the market had to offer. Seeing a capability gap, we set out to create a bolt carrier group that could live up to the GUNNER name with no compromise in strength or function.

Featuring our new Right To Bear Lightweight 5.56/.223 BCG, weighing in at approximately 8.9 Ounces, or 252.5 Grams for you lightweight build fanatics! Using our low mass Bolt Carrier Group 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 & a reduced power buffer spring, you can tune the gas way down, which will reduce muzzle rise and carbon build up.

- Use this filler to get the coupon code working HERE. 100-024-845WB AR-15 FM-9 9mm Bolt Carrier Assembly Cartridge: 9 mm Luger Finish: Black Description Aids in Smooth, Reliable Cycling of Your AR-15 Pistol

Recoil Technologies AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group Want to see more deals from Omega Tactical Distribution?Subscribe to get deals straight to your inbox.   

Enhanced 9mm AR Bolt, combined with a Silent Captured Spring System. New to this revision of our JPBC-9SL and JPBC-9SL-SP bolt assemblies is last round holt open compatibility with our line of short-stroke Silent Captured Springs. This bolt assembly will provide reliable last-round lockback with any compatible receiver such as our GMR-15. Specifications for JP Enterprises EnhancedBolt 9mm AR Bolt Carrier Group Kit - JP Short Silent Capture Spring: Fabric/Material: 416R Stainless Steel Caliber: 9mm Luger J5-ABA-EB9KITSH-JPBC-9SL-SP5SS UPC#: 812872025629

This M16 Bolt Carrier comes with a properly staked gas key and is coated inside and out with UCT EXO Nickel Boron. UTC EXO Nickel Boron is a top of the line coating used by the most reputable manufacturers such as: FailZero, Spike's Tactical, Right To Bear, etc. These faceted AR15 / M16 carriers can be used to build any small frame AR caliber complete BCG. Just add a caliber bolt of your choice. You can pair these carriers with the bolt completion kits below to assemble a complete BCG. Coated Inside & Out With UCT EXO NiB 8620 Tool Steel (Carrier)

LUTH-AR offers replacement components for the AR-15 that are made to strict military specifications. These high quality components will provide excellent fit and reliable function in your AR series rifle and are perfect for upgrading existing components or replacing worn or broken parts.Luth-AR - Stripped AR-15 Bolt Carrier made with 8620 Steel. Features and Specifications Manufacturer Number: BC-01Caliber:223 Remington/5.56 NATO/.300 AAC BlackoutAR-15 Platform Bolt Carrier Made From 8620 Tool SteelBlack phosphate finish MPN#: BC-01  UPC#: 859819007997  ARR-089-025

The KAK Industry AR-15 Bolt Carrier Group comes with all the benefits of a premium BCG like an 8620 steel carrier, 9310 steel bolt, and is magnetic particle inspected for an additional layer of quality control. The entire 5.56 bolt carrier group also features a durable black Nitride finish for improved corrosion resistance and excellent surface hardness for a long service life. The M16 profile and full auto rating ensure this 5.56 BCG will run as long as you use it while the slick Nitride finish means cleaning is a breeze.

CHECK OUT OUR WHOLESALE PRICING STORE WIDE! WE HAVE ANDERSON LPKS IN STOCK! https://parts4myar.com/ The .308 Complete Bolt and Carrier Group is Nitride coated and Chrome Lined. The Carrier is made from 8620 steel, and the Bolt is made from 9310 steel and Nitride coated, MPI Tested. The .308 Bolt and Bolt Carrier Assembly comes complete with Cam Pin, Firing Pin and Firing Pin Retainer. This BCG works on the SR25 platform, AM-10, DPMS, POF, CMMG etc. BOLT: Made From 9310 Steel BOLT FINISH: Nitride CARRIER: Carrier Assembly Made From 8620 Steel

The Ballistic Advantage .308 AR-10 Bolt Carrier Group in Black Nitride is an excellent choice for anyone wanting to maintain and improve their current AR-10 or build a new AR. Each BCG features a carrier machined from 8620 steel and a 308 bolt machined from 9130 steel with a black nitride coating. The BCG has a properly staked forged gas key for reliable cycling and an S7 tool steel extractor with heavy-duty hardware. Ballistic Advantage manufactures these high-pressure tested and magnetic particle inspected bolt carrier groups, then test fires each one to ensure functionality.

DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.

Description 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.

Description The Palmetto State Armory DLC coated Bolt Carrier Group was designed with the serious AR enthusiast in mind. The bolt is made of Mil-spec Carpenter 158 steel, shot peened and high pressure tested. Gas key is machined out of bar stock, DLC coated, then secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is coated with DLC (Diamond Like Coated). Made in America with an unconditional lifetime warranty. Features: - Milspec Carpenter No. 158 steel bolt - Shot Peened Bolt - High pressure tested - Gas Key Hardened to USGI Specifications