Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Black Nitride
Only 8 left in stock
The Microbest Bolt Carrier Group is a great choice for any build. This drop-in AR-15 BCG features a corrosion resistant salt bath nitride finish, MIL-SPEC dimensions, and a magnetic particle inspected carpenter 158 steel bolt. Crafted from domestically sourced 8620 steel, the M16 cut carrier includes a gas key fastened by properly staked grade 8 screws. Made in the U.S.A. and covered by a lifetime warranty, you can count on this BCG for a lifetime of service.
Features:
- .233/5.56 NATO
- Salt bath nitride finish
- M16 cut
- Aircraft quality 8620 steel carrier
- 4130 steel gas key
- Properly staked grade 8 gas key screws
- Carpenter 158 steel bolt
- 4140 steel extractor
- MIL-SPEC O-ring
- MIL-SPEC gas rings
- 4140 steel cam pin
- 8740 steel firing pin with hard chrome finish
- Magnetic particle inspected
- Proudly made in the U.S.A.
| Weight | 15 oz |
|---|---|
| Bolt Material | Carpenter 158 Steel |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Finish | Salt Bath Nitride |
| Carrier Profile | M16 |
| High Pressure Tested | Individually HP Tested |
| Magnetic Particle Inspected | Magnetic Partical Inspected |
| Platform | AR-15 |
| Bolt Finish | Salt Bath Nitride |
| UPC | 14701 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Customer Reviews
- Reviews
- Questions
United States
Phosphate bolt
Mine came oddly, with a nitride carrier/gas key, phosphate bolt with a nitride extractor
So far so good.
I don’t have every gauge under the sun like that one nerd to test efficiency; however I didn’t see any obvious issues. I normally use phosphate bolts but wanted to try something new.
United StatesExcellent BCG
The BCG is just beautiful. Machining is precise and the finish is dark and even. I’ll definitely buy more of these. You just cant beat a bolt from such a renowned manufacturer at this price. Other companies buy these and resell them rebranded for twice the price.
USMicroBEST
No need to buy high end bcgs with laser engraved logos because these things rock and it is rumored time and time again that these are literally the same BCGs that companies buy and put their mark on. ANYWAYS STOP THINKING AND JUST BUY
USGood BCG
Really nice nitride finish. MP stamp is barely noticeable on the bolt, no HPT markings noted. Good staking. Functions just fine. Seems like a good BCG, especially when on sale.
