Microbest Full-Auto M16 Bolt Carrier Group, Phosphate & Chrome-Lined
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
- Ejector from S7 tool steel, heat-treated and shot-peened
- Manganese phosphate finish
Carrier:
- Machined from AISI 8620 steel
- Full-auto M16 profile
- Heat treated and Carburized/strain relieved
- Precision ground gas key interface
- Manganese phosphate finish with hard chrome interior
- Gas key from 4130 steel with chrome interior, secured with staked Grade 8 fasteners
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.
Seth (verified owner) –
Awesome quality bolt! Super fast shipping. I’m run mine in a 10.3 build and it’s running great!
Rick (verified owner) –
Great product I did gauge test on it looks great. They also sent me a pack of noodles and a note completely made my day..
Marty H (verified owner) –
3rd purchase from Rooftop. Won’t be the last!
Mark (verified owner) –
Great price, very good specs and tolerances on the BCG, and super fast shipping! Glad I found this company and I have already ordered again.
Vic Banana (verified owner) –
Five stars across the board, you can’t beat this price and performance for a milspec bcg