Microbest Mil-Spec C158 HPT/MPI 5.56 Bolt Carrier Group - Phosphate/Chrome-Lined
Out of stock
The Microbest BCG has been designed from the ground up with the most avid shooters in mind, using only the best materials available on the market today.  The bolt assembly is machined from Carpenter No. 158® steel, shot-peened, MP marked, HP tested, and has a tool steel extractor that is machined from bar stock.
Features:
- 4340 Extractor spring, mil-spec insert and extractor retainer pin in mag phosphate
- Mag phosphate ejector
- Mil-spec stainless gas rings
- 8620 carrier in FA profile chrome lined
- 4130 gas key with grade 8 retainers and sealed
- 4340 cam pin in mag phosphate
- 8740 firing pin in hard chrome
- 1038 retaining pin in mag phosphate
| Weight | 15 oz |
|---|---|
| Bolt Material | Carpenter 158 Steel |
| Cartridge Compatibility | .223/5.56 NATO/.300 BLK |
| Finish | Mag Phosphate |
| Carrier Profile | M16 |
| High Pressure Tested | Individually HP Tested |
| Magnetic Particle Inspected | Magnetic Partical Inspected |
| Platform | AR-15 |
| Bolt Finish | Mag Phosphate |
| UPC | 14699 |
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
This is the one....
The BCG is possibly the most important thing in the rifle and this one is perfect. Chrome lined on the carrier and the gas port to tight tolerances ensure long life on the important wear surfaces. The phosphate coating has an ever so slightly rough surface that holds gun oil after hundreds of rounds. I have 3 of these in my ARs and just make sure to oil them before I go shooting. They are flawless.
United StatesGotcha some son
Bruh I got me about 6 of these and they have all been good to me. You can't beat em. I do have a BCM bcg but only because they come free with the uppers right now. I have DD also with their rifles. Dudes these are the same. The same. It's great. The best. Get on it son. Catch em when they're on sale and stop fretting little ar bois.
United Statesexcellent
This bolt carrier has properly staked screws on the gas key. Others I have seen are not. Also, there are no defects or flaws on the one I received. I put 300 rounds through it a the range and perfect.
United StatesExactly what I needed
Very fast shipping 2 days bolt is amazing mine was marked mp and had the chrome at the end came well packed and oiled couldn’t be happier I’ll post again if have any issues first time out
phosphate finish bcg
Shipping was quick no problem ordering, bcg was oiled in a bag at first I thought they shipped a nitride BCG after cleaning I could see I was mistaken it looks about the same as my bcm but with a smoother finish no markings on bolt as far as HP tested or magnaflux tested I will take there word at it being both . I have a Ao, bcm, and this microbest and I like it the best so far
