Replace the stock plastic barrel retaining nut and clamp with our sturdy aluminum barrel retaining nut and aluminum clamp. Clamp features M-LOK accessory slots on each side. This allows versatility for a wide range of accessories over the stock QD swivel, including rails and lights.Features :Aluminum Extension Cover with NutAluminum Clamp with M-LOK SlotMounting HardwareFits Beretta 1301 Tactical Mod. 2 and A300 Ultima with Plastic Factory Magazine Extension Cover