The LaRue Tactical RISR™ (Reciprocating Inline Stock Riser) / CTR Combo Cheek Riser is a specialized stock accessory engineered to solve charging handle clearance issues on collapsible rifle stocks. Traditional fixed cheek risers obstruct the rearward travel of standard AR-15 and AR-10 charging handles unless the stock is set to a fully extended position. Built with an internal steel spring mechanism, the LaRue RISR moves rearward when struck by the charging handle during cycling and automatically returns forward under spring tension once the handle is released. This mechanical action allows shooters to maintain proper optical alignment and full firearm cycling capability across all stock positions.

Key Features

• Spring-Loaded Reciprocating Design: Slides rearward when contacted by the charging handle and springs forward automatically, preventing mechanical interference.
• Optical Alignment Enhancement: Delivers approximately 0.5 inches (12.7 mm) of cheek weld elevation over the factory stock comb for straight-line sight alignment.
• Direct Fitment: Clamps securely onto Magpul CTR and MOE collapsible buttstocks using standard Phillips-head hardware without permanent rifle modifications.
• Durable Construction: Built from glass-reinforced polymer with internal steel springs designed to withstand standard centerfire recoil impulses.

Specifications

• Product Code: 670-015-748 (LT748-BLK)
• Material: Glass-reinforced polymer with steel spring and hardware
• Elevation Height: Approximately 0.5 inches (12.7 mm)
• Colour: Black
• Interface Compatibility: Magpul CTR and MOE carbine buttstocks
• Platform Compatibility: AR-15, AR-10, SR-25, and buffer-tube-adapted chassis systems
• Power Requirements: None (purely mechanical)

Who is the LaRue Tactical RISR Cheek Riser for?

• AR-15 or AR-10 platform shooters utilizing raised optic mounts — requiring the 0.5-inch (12.7 mm) elevation provided by this cheek riser to establish a consistent, natural cheek weld when aligning with elevated scope setups or lower 1/3 co-witness optic mounts.
• Hunters and tactical shooters operating with shorter lengths of pull — needing this reciprocating AR-15 stock cheek riser so the charging handle can travel its full stroke without obstruction, even when shooting with the buttstock in fully collapsed or intermediate positions.

Less suitable for: Rifle setups utilizing fixed rifle stocks, dedicated precision stocks like the Magpul PRS or UBR, or non-Magpul pattern stocks; these platforms require direct-mount fixed cheek pieces or fully adjustable precision stocks with integrated comb-height dials.