IMI Defense IVG – Interchangeable Vertical Grip Net-Weight-(g)_256 and a Nylon Fiber lower

and a Nylon Fiber lower rail to mount any forearm grip

PTS 38rds PMAG Style Gas Magazine for KSC / KWA M4 GBB

Putting this together is very easy:

Tokyo Marui EBB Centimaster

IMI Defense IVG – Interchangeable Vertical Grip Net-Weight-(g)_256 and a Nylon Fiber lowerThe IMI Defense IVG Interchangeable Length Vertical Grip is a light weight, round profile, highly durable modular vertical grip, textured for enhanced grip ability and rifle control. The Grip can be shortened or lengthened via a screw in section. IMI Defense IVG Interchangeable Vertical Grip Made of high quality fiber reinforced polymer compound. Highly durable. Fits any 1913 rail, no installation tools required. 2 stage length modularity. Waterproof