G&P Rotary Hop Up Unit for Marui & G&P M4/ M16 & G&P E.G.T. Guns (Except M.T.F.C. System)

G&P Rotary Hop Up Unit for Marui & G&P M4/ M16 & G&P E.G.T. Guns (Except M.T.F.C. System) Metal Construction Ddesigned to make adjusting the hop up more precisely and accurately Suitable For Marui & G&P M4 / M16 Series AEG, For G&P E.G.T. Series Guns AEG (Except M.T.F.C. System) **This hop up unit is NOT compatible with the M.T.F.C. System and series of guns**