Douglas 18″ 5.56 Barrel – 1-7 Twist

Douglas 18″ Flat Dark Earth Cerakoted 416R stainless steel barrel with 1-7 twist and M4 feed ramps.  Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE  brakes and collar.   this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles.  Gas block area is .750 diameter.  Barrel uses a rifle length gas system and is chambered in 5.56 Nato