The Magpul UCS (Universal Carbine Stock) is engineered for versatility and precision, making it the perfect enhancement for firearms equipped with a rear vertical M1913 Picatinny rail. Engineered to accommodate a range of charging handles and ejection port placements, the UCS features a reversible hinge for both left and right configurations, ensuring seamless adaptability and function. Six (6) Position, Push-Button LOP Adjustment Allows Three 3" of Total Adjustment Compatible with All Firearms with a 1913 Rail on Rear of Firearm Receiver Reversible Folding Mechanism Elevate your shooting experience with the Magpul Universal Carbine Stock.