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KWA
KWA -LM4 Hop Up Cylinder Assembly (Part 4S)
The metal LM4 hop up Cylinder Assembly acts as the primary housing for the LM4 hop up system. It appears as part 4 on any LM4 diagram, but is also part 4,5,E-19,C10,I-20 and D-72 on the PTS MKM AR-15 and PTS MML MATEN. Most internals for the PTS MKM AR-15s are compatible with the LM