The ProWin Hop Up Kit for the Western Arms & King Arms GBB M4 Series is much more than just a reinforced replacement part for the original ABS plastic hop-up chamber. Actually, it is a remarkable upgrade that allows the user to use regular AEG inner barrels in thair Western Arms or King Arms M4 series GBB rifles for a better choice of length, material and bore size of the barrel. The kit also includes an adjustment dial that rotates just shy of 360° for a wide range of adjustment, as well as a swinging arm that has two pressure points for a more consistent spin and better centering of the BB in the chamber.
Model: Hop Up Kit for WA and King Arms GBB M4 series
Package Includes: Hop up chamber, adjustment dial, swinging arm, hop up bucking
High quality polymer construction
Allows AEG barrels to fit GBBR rifles
Wide range of adjustment
Two pressure points for more consistent spin
This hop up kit is designed specifically to work with the Western Arms and King Arms gas blowback M4 series rifles. It may fit other brands, but this cannot be guaranteed by Airsoft GI.
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