Vertical foregrips are a very useful accessory to help control the front end of your airsoft gun. G&Gs line of polymer foregrips are here to fill that need. There are 2 options, with and without rail sections at the top of the grip. If you have a full rail system, consider using the standard model. If you have limited rail space on your airsoft gun, like a pistol or small SMG, consider using the railed model so you can also mount lasers and flashlights. These foregrips are mounted via the screw in base. you unscrew the base, slide the foregrip onto your 20mm rail, and then screw the base back in to lock it in place.