This kit is not 100% drop-in and should be installed or checked over by a competent gunsmith prior to shooting. Kit includes: EGW HD Hard Sear EGW HD Stainless Steel Lightened Hammer EGW Ball Head Disconnector EGW Evolved Sear Spring 19# ISMI Main Spring This kit is not 100% drop-in and should be installed or checked over by a competent gunsmith prior to shooting. Please note: EGW hammers should not be coated by applications that require the product to be heated. These coatings heat the hammer and can cause the hammer to become brittle. Some coatings such as Robar's NP3 will work fine, but please consult the coater before to make s Mfg: Egw