Andrews Arms LLC BCG https://www.andrewsarms.com Your Guide to Firearms Tue, 07 Apr 2026 20:04:24 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 121958742 SOLGW BOLT CARRIER GROUP 5.56/300BLK CARPENTER 158 SP/HPT/MPI https://www.andrewsarms.com/product/solgw-bolt-carrier-group-5-56-300blk-carpenter-158-sp-hpt-mpi/ https://www.andrewsarms.com/product/solgw-bolt-carrier-group-5-56-300blk-carpenter-158-sp-hpt-mpi/#respond Sun, 05 Apr 2026 22:44:03 +0000 https://www.andrewsarms.com/product/solgw-bolt-carrier-group-5-56-300blk-carpenter-158-sp-hpt-mpi/ SOLGW looks at the bolt carrier group as the heart of the gun. If the gas port is the lungs, then the bolt carrier group is the heart. It’s what drives the entire gun. If you look at the AR platform’s cycle of operations, everything happens around the bolt carrier group. Locking, unlocking, extracting, ejectingall of it begins with the bolt carrier group.

 

Works for 5.56 NATO, .300 Blackout, 6mm MAX and .350 Legend cartridges.

SONS OF LIBERTY BOLT CARRIER GROUP:

Best Bolt Carrier in the industry!

Bolt:

  • Precision machined from Carpenter Technology No. 158 chrome-nickel alloy
  • Heat treated per mil-spec,
  • Shot peened per ASTM B851/SAE AMS2430S,
  • Vibratory tumbled
  • Individual high pressure/proof (HP) test
  • Full Auto test fired at assembly
  • Individual magnetic particle inspection ASTM E1444/E1444M (MP)
  • Markings deep laser engraved (SP=Shot Peened, HP=High Pressure Tested, MP=Magnetic Particle Inspection.)

Extractor:

  • Precision machined from 4340 tool steel alloy per SAE AMS6415T/AMS6484D (vs 4140)
  • Heat treated
  • Shot peen per ASTM B851/SAE AMS2430S

Extractor Retaining Pin: 

  • Precision machined and ground S7 Tool Steel
  • Heat treated per ASTM A681-08
  • Shot peened per mil-spec print
  • Manganese phosphate

Extractor Spring:

  • Tactical Springs/Sprinco 5 coil, ASTM Grade A401 Chrome Silicon wire stock
  • Heat treated
  • Stress relieved, Molybdenum-Disulfide infused
  • Cryogenic processed (Hidden post winding)
  • Mil-spec black insert/synthetic elastomer extractor buffer (nitrile-butadiene, shore hardness 80+/-5 durometer per MIL-PRF-6855)

Ejector:

  • S7 Tool Steel
  • Heat treated per ASTM A681-08
  • Shot peened per Mil-Spec
  • Manganese phosphate
  • Ejector Spring:
  • Heat treated
  • Mil Spec

Gas Rings: 

  • Standard stainless steel per Mil-Spec X3

Carrier:

  • Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
  • Full auto profile
  • Heat-treated
  • Carburized/strain relieved, hard chrome bore
  • Precision ground gas key interface
  • Sons of Liberty Battle Flag logo deep laser engraved
  • Manganese phosphate

Gas Key:

  • Machined from 4130 Chromoly steel alloy per ASTM A108/A322-13
  • Heat-treated; hard chrome internal
  • Manganese phosphate
  • Permatex sealed
  • Grade 8 hex screws torqued and staked Hidden per mil-spec

Cam Pin: 

  • Precision machined 4340 Chromoly steel alloy per SAE AMS6415T/AMS6484D
  • Heat-treated/processed per mil-spec
  • Manganese phosphate
  • Solid film lubricant applied and cured per mil-spec

Firing Pin:

  • Precision machined 8640 steel alloy
  • Heat treated/processed per mil-spec
  • Hard chrome plate

Firing Pin Retaining Pin: 

  • Precision machined from 1038 carbon steel
  • Heat-treated/processed per mil-spec
  • Manganese phosphate

Find out why this is the Best Bolt Carrier Group in the industry. Son’s Of Liberty Gun Works

]]> https://www.andrewsarms.com/product/solgw-bolt-carrier-group-5-56-300blk-carpenter-158-sp-hpt-mpi/feed/ 0 122700 M16, AR15 Bolt Carrier. Mil Spec .223/5.56 Nitride Bolt Carrier Group https://www.andrewsarms.com/product/m16-ar15-bolt-carrier-mil-spec-223-5-56-nitride-bolt-carrier-group/ https://www.andrewsarms.com/product/m16-ar15-bolt-carrier-mil-spec-223-5-56-nitride-bolt-carrier-group/#respond Mon, 20 Jan 2025 22:11:36 +0000 https://www.andrewsarms.com/product/m16-ar15-bolt-carrier-mil-spec-223-5-56-nitride-bolt-carrier-group/ These mil-spec BCGS go above and beyond Mil-Spec expectations! They are PRECISION GROUND. They machine and grind the BCGs to perform for tens of thousands of rounds. They grind the outside dimensions and ALL three interior dimensions of the carrier, giving our BCGs a near frictionless surface finish. To ensure long-term reliability and corrosion resistance, partnered with H&M. Their Black nitride finish delivers the utmost durability and improved lubricity for the BEST-IN-CLASS BCG that is 100% American Made!

M16 Style Carrier

Machined from 8620 Steel

Heat Treated

Final Grind Before Plating

Blacknitride by H&M

5.56/.223 Bolt

Machined from 9310 Steel

Heat Treated

Shot Peened

MPI

Blacknitride by H&M

Cam Pin

Machined from 4140 Steel

Heat Treated

Blacknitride by H&M

100% American Made

]]> https://www.andrewsarms.com/product/m16-ar15-bolt-carrier-mil-spec-223-5-56-nitride-bolt-carrier-group/feed/ 0 121294 AR-15 Bolt Carrier, Nitride https://www.andrewsarms.com/product/ar-15-bolt-carrier-nitride/ Sat, 17 Sep 2022 13:47:01 +0000 https://www.andrewsarms.com/?post_type=product&p=119257

Description

Our Performance M16 Bolt Carrier Assemblies are engineered and feature packed to increase the durability and reliability of your weapon system. This is a carrier and gas key assembly only.

Features:

  • 5.56/223/300BLK
  • M16 profile
  • Friction points reduced while maintaining stability
  • Sand cuts on rail of carrier
  • Nitrided throughout assembly
  • MPI
  • Shot Peened
  • Mil-Spec Staking on the Key
  • Weight 11.5 ounces
  • Made in USA
]]> 119257 Luth-AR, Helical 1 Piece Gas Ring, .223/5.56 https://www.andrewsarms.com/product/luth-ar-helical-1-piece-gas-ring-223-5-56/ Sat, 17 Oct 2020 00:00:25 +0000 https://www.andrewsarms.com/?post_type=product&p=116399 High quality components and precise manufacturing make LuthAR parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.

  • Precise Manufacturing
  • Long Term Reliability
  • Durable Construction
]]> 116399 Luth-AR, Bolt Gas Rings AR-15, 3-Pack https://www.andrewsarms.com/product/luth-ar-bolt-gas-rings-ar-15-3-pack/ Fri, 16 Oct 2020 23:36:15 +0000 https://www.andrewsarms.com/?post_type=product&p=116391 High quality components and precise manufacturing make LuthAR parts ideal for maintaining and upgrading firearms. The durability, reliability and excellent build quality of these parts will ensure years of service you can count on.

  • Precise Manufacturing
  • Long Term Reliability
  • Durable Construction
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