Microbest Full-Auto M16 Bolt Carrier Group, Chrome & Phosphate Extractor
The Microbest Bolt Carrier Group is the measuring stick by which all others are compared.
Microbest is the OEM manufacturer and supplier of bolt carrier groups for a lot of popular rifle manufacturers, including but not limited to, Bravo Company Mfg and Sons of Liberty. Microbest is trusted to build a bolt carrier group that exceeds the MIL requirements from the right materials and processes with great attention to detail.
Assembled with Sprinco springs and inserts for longevity and reliability.
Specifications:
Bolt Assembly:
- Bolt precision machined from Carpenter 158 alloy and vibratory tumbled
- Heat-treated and shot-peened
- Individual high pressure/proof (HP) and individually magnetic particle inspection
- Extractor from 4340, heat-treated and shot-peened, manganese phosphate finish
- Ejector from S7 tool steel, heat-treated and shot-peened
- Hard chrome-plated finish
Carrier:
- Machined from AISI 8620 steel
- Full-auto M16 profile
- Heat treated and Carburized/strain relieved
- Precision ground gas key interface
- Gas key from 4130 steel, secured with staked Grade 8 fasteners
- Hard chrome-plated finish
Misc:
- Cam pin from 4340 chromoly steel, heat-treated
- Firing pin from 8640 steel alloy, heat-treated, hard-chrome plated
- Firing pin retaining pin from 1038 carbon steel, heat-treated
Click here to browse our entire selection of Bolt Carrier Groups & Parts.
Donald J. (verified owner) –
Bcg is great. Rooftop is better.
Cody C. (verified owner) –
This BCG is extremely solid for the price. I switched from an Aero Precision BCG that was showing quite a lot of wear only a few hundred rounds in and I had heard good things about microbest chrome BCGs. Rooftop defense has some of the best pricing on these so I grabbed 2. They also look really cool woth the chrome and my AR-15 shoots perfectly with it.
Madison B. (verified owner) –
The bolt carrier group is top notch, just like Roof Top! I’ve ordered from them multiple times and have been nothing less than incredibly impressed with each transaction. Keep up the good work!
Kanavut K. (verified owner) –
Microbest is one of the OEM manufacturers for BCG. Their BCGs are used by SOLGW, Sionics, PSA, and more. Even BCM is speculated to use Microbest BCG.
On a side note, Rooftop needs to upload some pictures of the product. Currently it only displays a placeholder image.
Danny K. (verified owner) –
Great BCG