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

46 Reviews

In Stock

Orders of non-FFL items will ship same day if ordered before 3:30pm CST (M-F). FFL orders will ship within 5 business days if transfer details are provided.

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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
  • SOLGW Bolt Carrier Groups
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

46 reviews

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Great upgrade to any AR

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cycles amazing and company has a great reputation for quality products coupled with lifetime warranty. big fan of SOLGW

Top of the line BCG

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Absolute perfection. This is an extremely well made BCG, one of the higher end BCG you can get, but it’s completely worth every dollar. Not to mention, (not that you would even need to use it) SOLGW has one of the best warranty polices in the firearms world. Don't cheap out on the heart of your build, get quality, get a SOLGW BCG

Top Quality

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Top Quality BCG and reliable, speedy delivery. SOLGW philosophy on their BCGs is, "make a hole and fill it." Looking for ward to yesr of reliable service at a good price.

You can’t get better than SOLGW

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I bought this for a build I’ve been working on. SOLGW is the best manufacturer of guns and gun parts.

Sons of Liberty BCG

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The bolt carrier group by Sons of Liberty Gun Works is the heart of the rifle. Each one is tested for function in a firearm during inspection for awesome quality control. I can't recommend it enough.

Nothing fancy

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Just a properly built BCG with a great warranty

Quality BCG

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I purchased this bolt during a sale which made this an absolute no brainer. When it comes to quality Sons of Liberty is top notch. The bolt movement is smoothe the lockup is snug as long as your other parts are milspec. The staking is excellent and uniform. Some will tell you that you can get a quality bcg for way less and they have had no issues, but the difference is the quality control. They might have no issues with that specific bcg, but the next one or the one you get my have issues. SOLGW has excellent quality control they back it with a lifetime warranty. Overall you can't go wrong with this bcg especially during a sale, stock up and get a few.

Reliable & High Quality

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I’ve ran over 1k rounds with zero issues the last 6 months. Ran over 300 rounds at a Tactical Games without lubricant. It has aggressive steaking on the gas key. It’s dependable and I trust my life to it.

Top line BCG

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I specked out my SOLGW BCG and it was as good as I have seen. Very tight tolerances and very gas efficient.. Top end like all of their products

Solgw bcg

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Quality part at a great price.