Check out the specs for this Bunny Custom MB47 SLR DMR Gas Blowback at Bunny Workshop. This is based on GHK AK GBB System with the Ready Fighter MB47 Receiver, and the SLR Style 13.5 inch MLOK S (Upper and Lower Rail). Other upgrades included are the Primary Arms AR Buffer Tube, Asura Dynamics AK Top Cover Rail with Marking Embedded, Magpul SL-K Stock, Magpul MOE AK Grip, and a 1-8 x Scope with Mount.