This rubber O-ring is a direct replacement for all LM4 Series rifles, and fits around the LM4 bolt base, part 60. The ring itself appears as part 191 on LM4 diagrams. Occasional replacement of this part helps restore compression, FPS, and cycling abilities of your KWA LM4. Bolt base sold separately.
Fits these models
F90, LM4 PTR, LM4C PTR, LM4D RIS PTR, LM4D/LM4D M-LOK
Match the number on your model’s exploded diagram in Part Finder & Diagram. Genuine KWA part, sold direct by KWA.


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