KWA C-10 Hop Up Tensioner, Part #64, 99, 127, 329 (LM4, HK45, Vector) 199-9999-C010

$4.75
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This hop up tensioner fits multiple KWA models, such as the  KWA LM4, Vector, kz.61 Skorpion and the HK45.  

Occasional replacement of this part helps restore the functionality of the hop up.