The KWA High Power LM4 Bolt Assembly is a drop-in bolt carrier group that fits the KWA LM4 PTR line, including the LM4C and LM4 RIS. This assembly comes with the nylon polymer bolt and metal Bolt Carrier Key pre-installed, and also includes the metal piston stop insert. This BCG will typically increase FPS by 50-70 and is easy to install. It’s a must have to make your LM4 field-ready in seconds.
This is the Law Enforcement edition upgrade. FPS is increased to ~400-420 FPS on .25g bbs.
Make sure your field is ok with the higher FPS.