First Factory Adjustable Outer Barrel & Gas Block Set for SIG AIR MCX Virtus SBR AEG (14mm CCW)

First Factory Adjustable Outer Barrel & Gas Block Set for SIG AIR MCX Virtus SBR AEG (14mm CCW) Metal Construction 14mm Counter Clockwise CCW Thread Suitable For SIG AIR MCX Virtus Electric Gun AEG Rifle Airsoft Guns