Wilson Combat Reduced Power Full-Size Spring Hammer Stainless Alloy 19 Lb.. 45 ACP shooting full charge ammunition.; NOTE: This is the hammer spring we install in our full-size .45 ACP pistols.; CAUTION: The mainspring and other springs are under tension and eye protection should be worn for disassembly. We highly recommend our video #396 which demonstrates the proper procedure for replacement of springs. Failure to follow proper procedure could lead to bodily injury or damage to your firearm.; Specifications for Wilson Combat Full Size Hammer Spring: Manufacturer: Wilson Combat Color: Stainless Fabric/Material: Stainless Steel Gun Model: 1911 Package Contents: Wilson Combat Full Size Hammer Spring What firearm models does the manufacturer say Wilson Combat Full Size Hammer Spring is compatible with? The manufacturer suggests that Wilson Combat Full Size Hammer Spring is compatible with 1911Wilson Combat 781SS-19: Reduced Power Full-Size Spring Hammer Stainless Alloy 19 Lb.