Building a kit or just looking for a back up set of springs for your Inch-L1A1? Don’t rely on 20 to 30 year old springs. New technology enables us to bring you brand new spring kits. This kit includes the following: outer recoil spring, inner recoil spring, gas piston spring, trigger spring, sear spring, extractor spring, Z sight spring, front sight spring, magazine release spring, firing pin spring, frame lock spring. This is the cheapest insurance you can buy to ensure your weapon is in tip top shape.