help with mp5 please
 

AE V4 mp5 is missfeeding and double firing.
the only upgrade i have in the gun is a tightbore, and i had someone do it that knows guns so it was done right...
what are the parts that may be causing this to happen?
and what parts do you suggest i upgrade to help this? (im going to put a modify 100 spring in along with everything u suggest)

Was it misfeeding and double firing before? Because if it wasn't, then that someone might not have put the tightbore in properly, unless it shot properly for a while after installing the tightbore before it started acting up.

no it didnt misfeed or doublefire before... and yea it was awosome for like 2-3 games after the upgrade, then when i took it out to shoot some targets and dial in my red dot scope it started acting up

Did you change BB brand between the time it acted up? Tightbores don't like being cheaped out on.

It might also be a bit dry. If you've got silicon oil spray, do a 1-2 second spray down the feed tube at the bottom of the mag well, then fire a couple mags through the gun.

You can also try turning your hopup to the least amount of hop and see if that changes anything. Sometimes a hopup that's over dialed can cause the problems you are reporting.

no this was happening when my hop up was all the way off i tried that already, and i keep it clean and lubed all the time... this is why i think its so strange.
im thinking it could be something with the airseal nozzle or feed tube... maybe even hop up bucking or somehting