Expo Arms 5.56 NATO Complete MIL-SPEC M16 / AR-15 Bolt Carrier Group - Phosphate

The finish is outstanding. Just like it should be. Inside looks super smooth. Overall, it is very well made. Works like it should.

As an armorer trained by a professional manufacturer well known and respected in the gun industry, who was heavily mentored by the late great William Larson from Semper Paratus Arms. I will tell you that this BCG is absolutely first class. I put them in all my rifles. Don’t let the price fool you because they are absolutely top-tier. You can’t go wrong with this BCG, the quality and the materials or top notch. My speculation is that you’re paying $50-$80 more for the same BCG produced from top-tier manufacturers just rebranded and sold to PA because of either overrun. Or because very minute cosmetic flaws that won’t affect the performance. Either way if you’re looking for a hard core use BCG at a great cost . In my opinion you’re going to be extremely hard pressed to find one at this cost. Especially when there on sale you can’t go wrong !!! Hope this helps.

I believe this is probably one of the best BCG's I've purchased. This is well put together and delivers awesome performance. I hardly ever believe in the "hype" in reference to most items I purchase. However this BCG lives up to positive reviews and other positive things written regarding this item by the manufacturer. PLUS- we were able to get a very good deal and had ultra fast shipping from Primary Arms. Thank you Primary Arms.

Haven't used it yet but appears to be well made. Good price with upper

Just an outstanding quality bcg. The best part is when these are on sale… you can grab them for less than 100$ thanks to primary arms.

PA Expo Arms BCG is my new go to for all future builds.

These are the measurements (+/- .0002”) from the Expo Arms bolt I purchased.

Bolt Tail Bore: G2 .251” +
Gas Ring Bore: G2 .499”
Shoulder Support: G2 .530”
Carrier Length: 6.675”
Carrier Key Bore: .180”
Bolt Length: 2.7995”
Bolt Tail Diameter: .2507”
Bolt Shoulder: .5279”
Cam Pin Diameter: .3109”
Cam Pin Bore: .3135” x .311”
Firing Pin Bore: .063”
F/Pin Diameter: .0585”
F/Pin Protrusion: .0305”

Quality bcg will definitely buy again, identical to my Microbest bcg’s

Got 2 of these for new builds. Haven’t sent any real egregious strings of fire through either yet but have performed well for a few hundred rounds so far.

Bcg made by Microbest. The excess of chrome lining in carrier is dead give away. Same as bcm and Daniel Defense. This bcg is up to par with bcm and Daniel Defense. I see these as the gold standard of bolt carriers. So that would make this expo arms a gold standard bcg. Don’t wait… just buy it… you know you want to…. Add to cart…. Everyone is doing it…..

I purchased this for my first rifle build in 2020. It still runs flawlessly and I haven’t had any issues with it.