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Problem with A&K M4 RIS full auto.

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    AF-UK Newbie

  • Members
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  • 14 posts

  • Guns: HK416
    Sig P226
    M4 RIS
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.



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