Armorer Works AW Custom CNC Magazine Base Plate for Hi-Capa GBB Pistols Gas MagazineArmorer Works AW Custom HX CNC Baseplate for Hi Capa GBB Gas Magazine. CNC machined aluminum construction. Engraved "1234" marking. The heavy duty CNC Machined baseplate is designed to withstand extremly rough treatment during practice and competition. The engraved numbering system allows competitive shooters to colour code and number their magazines to keep track of which ones they have in rotation, which allows you to quickly and easily keep track