GSI Outer Barrel Lock for MARUI M4 GBB Series [Steel]
Crusader Lower Receiver End Sling Mount for Umarex / VFC HK417 AEG & GBB
Crusader M4 GBB Rotatable Tactical Sling Swivels-BK
Lonex AEG/이노카츠/WA/LCT/VFC GBB용 강철 Sling Swivel-3Hole
PTS Enhanced Polymer Grip (EPG) for M4 GBBR-BK / DE
Crusader Steel Outer Barrel for Umarex / VFC UMP GBB
LCT GHK M4 GBBR 10.5inch Short Outer Barrel