Tropic_Blunder Posted December 26, 2011 Posted December 26, 2011 Hi guys, OK so here is my problem. I currently own an A&K M4 RIS which fires fine on semi auto, however when I fire on full auto it misfires straight away with no bb exiting the barrel. I have tried all different makes and models of M4 mag from PMAGS to JG mags and nothing works. I'm just about to open this thing up but wondered if any of you guys had an idea of why this might be happening? Internals are:- SP150 spring Deepfire piston body Slient piston head Madbull tightbore Metal spring guide 2000 mah lipoly Systema gears Metal shims and bushing Standard motor I have this exact same setup in another gun and have no problem. I'm guessing its the hop up. Thanks Dan.
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