Caliber

10.5" AR-15 Pistol Upper - 300 Blackout, Parkerized Barrel, 1:8 Twist, 10" M-LOK Rail

10.5" AR-15 Pistol Upper - Parkerized M4 Contour Barrel, 1:7 Twist, 10" M-LOK Rail

16" AR-15 7.62x39 Upper - Parkerized Heavy Barrel, 1:10 Twist, M4 Carbine Handguard

16" AR-15 Upper - Parkerized M4 Contour Barrel, 1:8 Twist, M4 Carbine Handguard