Each magazine has a unique part number which identifies the round count, caliber, whether it has a removable basepad or welded flush floorplate, and whether it's for an Officer or Government grip length pistol. For example, the 8R-45-RG is an 8 Round .45 caliber, Removable basepad magazine for Government length pistols (see diagram below). Some magazine part numbers will also include (CS) at the end. The (CS) identifies Custom Shop magazines.