Magpul RVG – Rail Vertical Grip, Black. The RVG is a basic, light weight, cost-effective vertical fore grip. Shape is ergonomically designed for use as a traditional vertical grip. It has also been optimized for use with the "thumb break method" of shooting as taught by Magpul DynamicsSM. Designed for use with 1913 Picatinny railed hand guards. Includes all mounting hardware plus a universal mounting rail for custom fitting to many factory plastic hand guards.