Combat Armory AR9 4.5" 9mm 9x19 1:10 1/2x28 Barrel 416 Dark Earth

Combat Armory Manufacturing AR9 4.5" 9mm 9x19 1:10 1/2x28 Barrel Coating Dark Earth Barrel Contour Medium Barrel Length 4 .5 Barrel Material 416R Stainless Steel Caliber Gauge . 9MM 9x19 Feed Ramps Polished Gas System: Blow Back Thread Pattern 1/2 X 28 Twist Rate 1:10 No indicator pin simple install just secure with barrel nut Combat Armory machinist take pride in delivering the very best for our customers used by Military, Police, and Firearms enthusiasts