This AR-15 M4 Carbine 6 Position Retractable Stock recoil pad slip-on rubber buttpad is designed for standard AR-15 6 Position Collapsible Stocks and similar shotgun stocks. The stock rubber butt pad design provides added texture for greater control and support and easily slips on and off. Fits most 5" Butt-stocks like Colt, Leapers Utg, Tapco, T6 Stock, Ruger AR and most aftermarket shotgun and rifle 6 position collapsible stocks. It fits a 5 inch butt of stock. Be sure to measure your butt-stock before ordering.