King Arms just released yesterday new gas blowback rifles in CQB-R and M4 RIS versions. These have full Colt marking licensed from Cybergun and the package comes with a 50-round gas magazine, foregrip, 2 rail covers, 2 valve blockers, 4 speed buffers, and a BB loader. To get the best performance out of these GBB rifles, Green Gas is higly recommended and you can adjust the ROF by using the speed buffers.