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In just five minutes, the complete trigger system can be installed without requiring any modification or fitting of the trigger or receiver parts. Adjustments are made using setscrews, reducing the risk of damage. The JP Speed Hammer allows for fast lock time, and the "anti-walk" pins with button head cap screws enable easy removal and reinstallation of the trigger system. The overtravel adjustment screw allows the user to customize the trigger for a clean, crisp, single-stage release. Two hammer springs are included: the yellow spring gives a 3 to 3½ lb. pull for competition or recreational shooting with non-military ammunition, while the red spring provides a 3½ to 4 lb. pull and more hammer force for use with the harder primers found on military (5.56mm NATO) ammo or for law enforcement duty use. For a heavier, 4½ lb. pull for tactical applications or NRA Service Rifle competition, the JPS4.5 spring kit can be installed. The JPFCP-1EZ model is compatible with small pin (.154") receivers.