Upgrade your M4/M16 hop up unit.
â–ºAdjustment button with o-ring to assure tightness.
â–ºRedesigned pressure plate by adding an adjustment gear making accurate adjustment easier.
â–ºThe Hardened the pressure pint making the hopper ore accurate and stable with faster pressurization.
â–ºPressure Plates are interchangeable between raised prssure point type to the stock.Gives you two pressure plates for the price of one
Manual: http://jagprecision.com/media/wysiwyg/manuals/modify-metal-hop-up-chamber-manual.jpg
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