Sixmm Product Reviews go over the MadDog MK18 RIS II 12inch Rail Handguard that can be fitted to Tokyo Marui AEGs and GBBs. This features an MK18 Rail 12" RIS II, an aluminum 14.5" outer barrel, a full metal outer barrel compatible with Tokyo Marui M4 AEGs, and a gas block, with specifications including part number MP156-AEG-FDE, FDE color, a weight of 440g.