- APS 5.375"/5.875" Stubby Outer Barrel -14mm CCW For APS ASR Series M4 M16 AEG Rifles- Made out of metal.- One-Piece barrel construction.- Suitable for APS ASR Series M4 M16 AEG Rifles.- Barrel tip end has -14mm CCW counter-clockwise thread.- Full Length - Approx 5.375" (excluded front thread)- Outer Diameter - 22mm- Color - Black- Weight - Approx 145g- Original Packing