Q ACC-FIX-CRUTCH The Crutch Rear Grip for Underside of The FIX StockQ LLC. The Crutch Rear Grip ACC-FIX-CRUTCH is a purpose-designed accessory crafted for The FIX Rifle's underside. This QACC-FIX-CRUTCH rear grip enhances control and stability especially when shooting from the prone position offering firearm users improved ergonomics and maneuverability.Q LLC's Crutch is an accessory designed to attach to the bottom of The FIX Rifle's stock. This ergonomic addition enhances control and stability particularly when shooting from the prone position.