DPM Colt Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System Stainless. This system offers almost double force at the end of full open position of the slide. Compared to the OEM Buffer provides additional force that stops the violent rams on the frame. From the above effect the slide stops smoothly on the frame and offers less recoil. Further the moving parts of the rifles are protected offering longer life to the rifle. Finally the design of DPM Captured Version makes it easy to install on the frame. Specifications for DPM Colt 1911 Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System: Manufacturer: DPM Color: Stainless Fabric/Material: Stainess Steel Gun Make: Colt Gun Model: Colt Defender 3in Package Contents: DPM Colt 1911 Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System What firearm models does the manufacturer say DPM Colt 1911 Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System is compatible with? The manufacturer suggests that DPM Colt 1911 Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System is compatible with Colt Defender 3inDPM MS-1911/DEF: Colt 1911 Defender 3in Bull Barrel 9mm .45ACP Mechanical Recoil Reduction System Stainless