Modify Accurate Metal Hop Up Chamber for M16/M4 Series (HP-02-01)
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►Adjustment button with o-ring to assure tightness.
►Redesigned pressure plate by adding an adjustment gear making accurate adjustment easier.
►The Hardened the pressure pint making the hopper ore accurate and stable with faster pressurization.
►Pressure Plates are interchangeable between raised pressure point type to the stock. Gives you two pressure plates for the price of one