UAC sent in their new product designed for the Tokyo Marui Glock 17 Gas Blowback Pistol... "UAC new Match Grade Steel Hammer & Sear Set For Tokyo Marui G17. It is constructed by precision CNC with carbon steel. The tight tolerance ensure the hammer & sear are in perfect shape. No burr was left behind, so no modify are needed. Also, titanium coating is used on the finishing to reduce the galling and friction.