It's getting rare to see a video from Booligan Airsoft and Shooting Sports these days. But for that rare video, he goes over the SRU GBB AR Bullpup Kit. This kit made for M4 airsoft rifles can be configured into Assault and CQB modes... "SRU keeps making wacky new conversion kits for airsoft replicas, and this latest version is for AR style AEGs."