The KWA LM4 PTR Hop Up Inner Barrel Clamp (Part 5) is a genuine replacement part for the LM4 Series hop up assembly. This reinforced nylon polymer section sits within the hop unit and plays an integral role in holding the inner barrel correctly in place, making it a practical choice for repairs, rebuilds and routine maintenance.
For experienced airsoft users, small internal parts like this can make all the difference when keeping a rifle running properly. Replacing a worn or damaged hop up inner barrel clamp helps maintain correct fitment inside the hop unit, which is especially important when servicing an LM4 PTR that has seen regular skirmish use.
It appears as part 5 on LM4 diagrams and is also used as part 5 on the PTS MKM AR-15 and PTS MML MATEN, with many PTS MKM AR-15 internals being compatible with the LM4 PTR Series. If you are working on a full hop unit service, it may also be worth checking related KWA parts, hop-up components or LM4 internal spares.
A simple but important fix for keeping your LM4 build complete and correctly assembled.



