Here's a high-quality rifle accessory every can use! Sometimes all you need is a small, rock-solid anchor point, and if your rifle add-on clamps to a Pic rail, this'll do the trick. Evolution Accessory Rails can be added or removed at any of 7 positions around the Evolution Series rail and also any place along the length of the tube. Compatible with Evolution Series only and RTR Series. 2" Accessory rail kit includes two rails, 4 slots per unit.