Picked up a 300 Blackout carbine length upper for my AR today, and a Fab Defense GL Mag butt stock. Really liking Fab Defenses quality I guess Isreali Special Forces know what they're doing. It's gonna be nice to have two rounds on one platform, and uses all the same magazines as my 5.56. Only thing I don't really like is the rail on the gas block is about 1/4" lower than the one on the receiver. I hope I can adjust for elevation properly.
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