Do these 3 things and you too can a 7.62! - TRYBE Defense AR-15 16in 7.62x39mm M-LOK Complete Upper Receiver

Got it in and packing was good. Upper was nice and tight. Everything was torqued to spec. Ditched the bcg for my BCM and took the actual bolt carrier from this one and replaced the extractor, firing pin, and extra power hammer spring. Running 28 round Duramags with it. I’m a brass snob so it’s your call if you prefer steel case. It ran like a sewing machine and it’s sub moa at 60 yards. The holes were touching. I used BRA pin, extractor, and spring. I also suggest swapping out the brake. There’s a Midwest industries 5/8x28 brake on here that’s pretty sweet