I have only used this on a lower with Colt magazines, I'm not sure if it works with any other type. I bought this a few years back and it's had probably less than a thousand rounds through it. I have recently purchased a buffer less upper, and it only works with Glock magazines. I took off my suppressor mount, and put on a bird cage flash hider, I didn't have a crush washer, so it is just hand tight. I believe it's threaded for 1/2x36. Includes Samson Evolution 7" handguard, picatinny adapter. I found two extra picatinny sections. There are a couple of small tool marks on the barrel. It is 1:10 Right-Handed twist, if I'm reading it correctly. The handguard is 7", the barrel is 1/2" longer.
According to the pictures of 9mm bolts, it is a CMMG.
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