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

39 Reviews

In Stock

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Standard orders will ship out in 1 business day (M-F) if ordered by 3:30 pm CST. FFL orders will ship within 5 business days or less as long as we have the information for the transfer destination. NFA items will take longer to ship and are dependent upon ATF processing times.

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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

39 reviews

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Top of the line BCG

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Well-made BCG. Components are all exceptional. Meets and exceeds mil-spec. Exactly as SOLGW advertises.

EXTREMELY happy with this purchase!!!!!!

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Extremely well made BCG, one of the higher end BCG you can get and 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

Best in the business! Great BCG!

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Extremely happy with this purchase!
Very well made with quality components.
I emailed SOLGW with a question and got a response in 20 minutes! Well packaged lubed and ready to go. I will look to order SOLGW parts first from on. I highly recommend this bcg.
Not to mention I ordered it on a Friday and received it the next Tuesday! Great job Primary Arms.

A+ quality

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Excellent BCG. Staking is picture perfect, and components are top shelf quality. SOLGW is a great company making great products.

BCG Battle Ready

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SOLGW is the best no nonsense BCG in the game. The thing to designed go through hell and back. 10,000 rounds zero malfunctions or failures. Buy with confidence ladies and gentlemen.

One of the best money can buy


This is the best BCG I have ever used other than my LWRC. Everything about it is perfect. This is my go to company for all my AR15 needs. No one comes close, not even BCM. I have personally talked with the owner on his cell phone and he even threw in a free shirt that I mentioned I liked just for the minor trouble I had with my order. The best customer service there is besides PA!

Quality bcg

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Wow very nice bcg for the money especially
if you got one on sale. Everything looks
great, you can definitely tell this is a quality piece. Good to go imo

Buy it

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Great bcg.

Great quality at a good price point


Great BCG. Have shot mine dry, wet, and dirty and haven’t had any issues. Took a 3 day rifle class for LE work with a personal build and the Sons of Liberty BCG functioned flawlessly dry, wet, and dirty. I might clean it once a year.

good to go

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I normally use bcm bcg but purchased the sol for my most recent build because of a recommendation. I can say i was very pleasantly surprised. Several thousand rounds later and zero issues. Also the finish has held up very well. Not a single negative to report. High quality stuff