the X9 is backwards compatible with all previous Classic Army Nemesis series AEG upper receivers

and quad wield

6V NUNCHUCK

SLING MOUNTS COMPATIBLE WITH MOST RECEIVER-MOUNT SLING ATTACHMENTS

Airsoft Masterpiece Custom v.2 Grip Screws(2pc) for Hi-Capa GBB Pistols (SILVER) E&L the X9 is backwards compatibleSpecifications Brand: Airsoft Masterpiece Material: Stainless Steel Color: Silver Compatibility: Tokyo Marui Hi Capa GBB Pistols Package Includes: 2X Grip Screws Features Durable stainless steel construction enhances overall strength Excellent as a replacement or upgrade for Tokyo Marui Hi Capa pistols Scratch and corrosion resistant Attaches pistol grip plates onto airsoft pistol frame