M4 profile, .750 gas block, carbine gas system, 16.5". I got this with some other used parts and I don't need it. Clean bore, Unknown round count. Was previously poorly painted which I removed [don't sue me if you find a little left over paint residue, I'm old OK;] Finish looks good now. Barrel shown is the one that you will receive. I will include an A2 muzzle brake along with a new crush washer. $78 $70 shipped where legal. Electronic payment preferred but snails mail works too. Thanks for looking!