Great buffer tube but... - Phase 5 Weapon Systems Inc Hex-2 AR-15 Rifle Length Buffer Tubes f/ Tailhook Mod1 Brace

I really like the buffer tube look and feel. Be aware that with a 10.5" upper, this tube will make your pistol outside the ATF maximum length of 26" (just under 28"). That's OK, the length of pull is comfortable and I'll use it on a carbine.