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.
Anthony Rittenbury (verified owner) –
Good fit for my 300blk pistol even better company/website new go too
Anthony Rittenbury (verified owner) –
Good fit for my 300blk pistol even better company/website new go too
pcfriedrich (verified owner) –
Very impressed with the quality of Microbest. Rooftop typically doesn’t carry “budget brands”. The fact they carry Microbest is a testament to the quality of the product, regardless of price. The chrome plating is a matte finish and covers the carrier and bolt, inside and out, and the extractor is black phosphate. I wish they would publish a picture of this BCG. This is my new go-to BCG.
Joe Hollinger (verified owner) –
Microbest makes great BCG’s and the price is hard to beat, especially for chrome. Rooftop is always fast and have great prices!