CNC Hop Up Chamber for WE M4/MSK/L85 GBB Rifle – Gen 2 Ver.

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<li><span>Material: Aluminium 6061 T6 and Stainless Steel parts</span></li>
<li><span>Including Two Hop Up Arms for different Hop Up Buckings</span></li>
<li><span>Compatible with old and new WE M4 GBB uppers</span></li>
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