MK-16 13.5` GBB
MK-16 9.3` GBB
VIPER TECH M16/M16A2 20 Inch GBB
VIPER TECH MK-12 MOD 1 GBB (W/Crane Stock)
VIPER TECH MK-12 MOD 1 GBB
VIPER TECH M16/M16A1(M653) GBB
M4 Pistol 8 inch Steel Outer Barrel|M4 Pistol 8 吋鋼製外管
M4 Pistol 7inch Steel Outer Heavy Barrel|M4 Pistol 7 吋鋼製重管外管