Ready to install, fully finished parts give a crisp, clean trigger pull. All engagement surfaces are correctly ground for positive hammer/sear engagement. Hammer has low-mass oval cut spur that reduces lock time. Narrowed sides improve function by reducing drag. Sear primary angle is cut; just polish it and stone the relief angle for a super clean breaking trigger. SPECS: MIM cast 4340 steel, Hardened to Rc 47-52. Matte black finish.