Battle Arms Development Xiphos, Stripped Lower Receiver, 9mm, Anodized Finish, Black, Compatible with Glock Pattern Magazines XIPHOS-LR BATTLEARMS XIPHOS Dedicated Lower Receiver. Uses GLOCK Magazines - Small Frame Glock Calibers. Is not compatible with CMMG Delayed Blowback systems that use an AR Style magazine and Bolt Carrier Group.