LaRue Tactical RISR Reciprocating Inline Stock Riser OD Green. It's a fact that some AR's need a cheek riser to get proper cheekweld for raised scopes or rifles with raised rails. It's another fact that standard AR charging handles require a lot of travel making it impossible to charge a rifle without moving a collapsible stock all the way to the rear. The LaRue RISR solves these problems. Made out of glass-reinforced polymer the RISR is spring-loaded and travels to the rear as the charging handle is moved to the rear. When the charging handle is released the RISR snaps forward. Designed to fit the excellent Magpul CTR butt stock without modification the RISR only takes a few minutes to install with a phillips-head screwdriver. The RISR comes complete with all mounting hardware. Specifications for LaRue Tactical RISR Reciprocating Inline Stock Riser: Manufacturer: LaRue Tactical Condition: New Condition Quality: Excellent Condition Details: Other Package Contents: LaRue Tactical RISR Reciprocating Inline Stock Riser LaRue Tactical LT748-ODG: RISR Reciprocating Inline Stock Riser OD Green