Centurions Option UMP GBB AEG CNC Aluminium Rail System 6061 Aluminum with Anodizing finishCNC Machiningfor most of the UMP in the market such as VFC, CA, AresFCW UMP GBB AEG CNC Aluminum Rail SystemSKU: FCW-RAIL-UMPBK$82.50PriceQuantityAdd to CartBuy Now