This Foregrip is designed for 20mm Rail Systems, making it compatible with 95% of Airsoft Guns on the market. Even if you don’t have a 20mm Rail System on your replica, there are plenty of Rail Adapters and new Railed Handguards you can install on your RIF to make this fit. The Angled designed of Foregrips are great for players who adopt the C-Clamp or Overgrip style of weapon manipulation, however they can be used any way you wish, and look awesome whilst doing so! It is incredibly easy to install to a 20mm rail by removing the Screw completely, sliding the Grip into position and securing the Screw through the Grip and appropriate Rail Slot.