Airsoft Zone have sent over details of their custom G&G GC12 SPR:
Airsoft Zone Custom Series excellent G&G GC12 SPR with metal body locked to single shot, upgraded to 420fps and prefitted with a GATE PicoAAB Active Breaking MOSFET!
All at a bargain price and ready to go – sniping has never been that easy!
http://airsoftzone.co.uk/gc12-m4-spr-single-shot-420fps-dmr-custom-aeg-gng