This kit is designed for the G&G ARP 9, however it is compatible with the G&G ARP 556 and most parts are compatible with other variants of M4. Zero One Airsoft,Airsoft,Air Soft,Dorset,Hampshire,softair,,Airsoft,ARp556,ARp9,BB Gun,Guay,Guay2,Pcc9,Pellet,Power Ranger,Softair,,G&G,Super,Ranger,Kit,for,ARP,9,556,Fire,Red |