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.
john E. (verified owner) –
Solid BCG. Looks great and functions flawlessly. Excellent and speedy service, as always, from rooftop defense.
Tyler (verified owner) –
Very nice bcg and great people to do business with highly recommend
Aiden H. (verified owner) –
Got this to replace a PSA BCG that the bolt was stretching. So far I’ve got 90 rounds with it. Wipes clean easy. Gonna put it through the wringer with 3 gun.
Erik M. (verified owner) –
This review is for the service provided by whomever operates this website. Outstanding!
Daniel L. (verified owner) –
Looks solid. product arrived exactly as described. Looks amazing too amongst all the black parts,that one Chrome piece stands out nicely. Would definitely buy from rooftop defense again.