BOBRO Vertical Fore Grip with Self Aligning Compression Lock (SACL). These vertical fore grips are the quickest and most secure VFG on the market place. It’s new patent pending Self Aligning Compression Lock allows easy one hand operation and fits on just about every rail system known to man. The other huge benefit is the fact that lights, lasers or other accessories on the bottom rail does not need to be removed in order to install or remove the VFG. Watch the video and see for yourself.