Sons of Liberty Gun Works 5.56 M16 / AR-15 Bolt Carrier Group - Phosphate

37 Reviews
Add to cart for sale price $169.00 $179.00

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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. Every part on a BCG has a specific function and must be made to the highest standards so it doesn’t fail. The gas key is made from 4130 chromoly steel and has grade eight properly staked hex screws to prevent it from coming loose over time. This SOLGW bolt carrier group is a great choice if you are building or upgrading an AR-15.

  • Manganese phosphate finish for corrosion resistance
  • HPT and MPI
  • Hard chromed bore and gas key
  • Carpenter Technology 158 alloy bolt (shot peened)
  • 4340 Tool steel extractor (shot peened)
  • S7 Tool steel ejector (shot peened)
  • Full auto profile 8620 alloy carrier
  • 4130 Chromoly gas key with staked hex screws
  • 4340 Chromoly cam pin
  • 8640 steel alloy firing pin with chrome plating

The Sons of Liberty Gun Works AR-15 BCG comes with many advantages like shot peening to help improve strength and even features small improvements like a precision ground gas key interface on the carrier to help secure the gas key in place. Even the cam pin has subtle improvements like a solid film lubricant that helps reduce wear when the bolt is unlocking. The firing pin is hard chrome plated to prevent breakage. This Complete bolt carrier assembly will ensure that your AR-15 will run reliably for many years to come.

Sons of Liberty Gun Works is a custom rifle manufacturer in the United States that specializes on the AR-15 platform. They began producing purpose-built weapons for law enforcement and civilians alike and are given a lot of praise for focusing on the details that make an AR reliable. Function over form is what their rifles are known for and they are guaranteed to get the job done. From full rifles to individual parts, you can’t go wrong with SOLGW.
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Bolt FinishManganese Phosphate
Bolt MaterialCarpenter 158 Steel
BrandSons of Liberty Gun Works
Caliber Gauge5.56 NATO
Carrier FinishManganese Phosphate
Carrier Material8620 Carpenter Steel
Carrier StyleM16 Bolt Carrier
High Pressure TestedHigh Pressure Tested
Magnetic Particle InspectMagnetic Particle Inspected
Weight11.4 Oz
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

37 reviews

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High quality BCG

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This bolt carrier group is very high-quality, appearance and specifications seem to be as good as any mil-spec bolt carrier on the market.


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Very well made. Will buy again.

Solidly built

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Bought these on a recommendation
<br> from a friend. I wanted a quality BCG for a new 3 Gun Rifle. I liked it so much after shooting my new rifle I bought a second for my other build.



Got the sons of liberty BCG and and it was a difficult choice between SOL and BCM. Went to the range and put 350 rounds thru it and did not have an issue at all. It performed perfectly and will definitely buy one more for another AR. It was a breeze to clean. Shipping was super fast also.

Fork Yeah!

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High quality BCG I bought 2 and they have been great in a BCM and LMT MRP Shovelnose upper. both uppers are 16 inch, but the fit and finish on the BCGS are top notch! these are legit AF buy and enjoy, we all know you're not shooting 10k 556 any time soon... SOLGW FTW buy this BCG the price can't be beat.

Simply Awesome


Let’s just say the package alone this BC came in was outstanding. So pumped that I went with Sons BC over BCM. You can see and feel the quality, also buttery smooth. SOLGW is such a great company. Buy with no worries.

Great product

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Everything you would expect from SOLGW. Great BCG cycles smoot and eats any ammo. Get one if you haven't already if you have get a second for other rifles