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.
Nicholas H. (verified owner) –
Bought one a received on Friday June 22 on a Sunday, thank you for the fast service. Checked and gauged the bcg and bolt everything checked out. from Thursday to Saturday I ran it through 1 class and a comp expending close to 1760(+/-40) rounds through the thing i had 3 failures that I don’t think attribute to the bcg one over inserted primer, one light primer strike, and one failure to feed from an old usgi mag i use to train with. Other than those issues the bolt ran well and clean suppressed on a 14.5″, 16″ and my 20″ inch. I will need to buy two more as my old np3 coated bcgs are lapping down a receiver and buffer tube extension. Thank you for the service, recommendation, quick ship, and the ramen lol. yall are killin it! ill update when i hit 5000rnds. cleans so easy I used brake clean lol and re-lubed on the class day prepping for a local match.
PSR (verified owner) –
Best bang for your buck and Rooftop Defense made it happen.
These guys are the chick-fil-a of the gun sports industry.
Quick, great shipping/humor, and overall great business to purchase from.
Thanks guys!
Dirti (verified owner) –
Microbest is one of the most utilized OEM BCG manufacturers for a reason, their products are great. This carrier group has almost all the features you would want, at a more than reasonable price.
Robert M. (verified owner) –
First off Rooftop is awesome. Now onto the BCG which was also awesome. Nice chrome job, nicely finished, good staking. Time will tell on longevity but with the way/amount i shoot they’ll bury me with it. Looking forward to picking up another when in stock and more noodles.
Paul P. (verified owner) –
Quality part for inexpensive as you can get, so far no complaints!