This Ignition Kit from EGW provides all of the parts needed to perform a top quality trigger job on your 1911 style pistol. This kit features EGW's new HD Hammer. The lightened hammer weighs in at 10.7 grams or (165 grains). This is not a 100% drop in kit and will most likely require fitting by a competent gunsmith.Kit includes: EGW HD Hard SearEGW HD HammerEGW Ball Head DisconnectorISMI 19 lb Main SpringColt Sear Spring