The LM4 PTR bolt carrier comes with the carrier key installed and will fit all LM4 PTR Series rifles, including the LM4 PTR standard, LM4C PTR, and LM4 RIS PTR, as well as the new LM4 KeyMod line. Please note that this does not come with the metal piston stop, part 36. The piston stop is sold separately and can be found in the link below:
The KWA LM4 Series semi-tightbore 370mm 6.05mm brass inner barrel is made of the highest quality material and is meticulously crafted to precise specifications. With this inner barrel, you can truly customize your LM4 to to fit any style of game play.
Although this barrel is the stock inner barrel for the LM4 PTR, it can be used in any LM4 Series rifle.