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Check your ARL and its spring are working properly, if its stuck open that can cause it to feed a bb at either end of the cycle.


Also best to go make an intro post before 1 of the mods gets on your case :yup:
 

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The gun worked ok prior to my overhaul so feeling a bit of a numpty at the moment! Modified the piston for correct AOE ( one tooth removed)

Looking for things to try ????
Be aware just cutting a tooth off doesn't correct your AoE, it just prevents pre-engagment when you have corrected your AoE.

If you have corrected your AoE properly, ie. maximum tooth face contact with the piston ate rest, which should happen when the primary teeth of both sector gear and piston are at the 12 oclock position, you should be cutting off all of #1 tooth, most of #2 and half of #3

As for your double feed issue, you say your running a AB MOSFET, try taking the ARL out and then just running it in semi only, the motor sould stop soon enough to prevent a double feed if the AB is working correctly, if you find its not and you can hear the gearbox unwind when you fire a single shot it could be your motor has been fried, which has de-magnetised the magnets reducing there pulling power.

also check your tappet plate and spring are working for the full length of travel and not getting stuck some where along the line.

And as this is a TM derived M14 check your cut-off leaver isn't worn, this will show up like a neon light in the dark when you try the gearbox minus ARL, as the box will just spin on as if nothing has tripped the switch to off, which of coarse is what has actualy happened :yup:
 
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