AGM M4 Blowback Issue!

[ScreaminEagle]

Hi all,

Would really appreciate any help with an issue im having with my m4!

Basically I've installed a 5ku lightweight bolt into my M4, after a bit of tinkering to make everything fit, the gas engine and bolt move freely when cocking the gun. However when I gas up a mag, cock the gun and pull the trigger, the round fires and the bolt blows back. But the gas engine stays in place, therefore not loading the next round...
Every once in a while with a fully gassed up mag the bolt will cycle and load another round the way it should but will then go back to not loading. Its not a mag issue though as they have been tested in another gas M4.

Anybody have any idea why this could be happening? Im using abbey ultra, with a couple of leak free mags and apart from the new bolt, everything's standard.

Cheers all!

[wantspliff]

Re: AGM M4 Blowback Issue!

is the loading nozzle sticking inside the bolt? (is it moving freely)