Bloody Hop up issues

[paulwes83]

Hey guys,

I custom built a metal bodied AK and she worked great a month ago, but now BBs jam in the hop up and sometimes fire 2 at a time, other times they just poop out the end of the barrel.

I'm using a promy tightbore, with a madbull 60 degree rubber and bucking, fed through a CYMA full metal hop up.

I can feel good air pressure coming out of the barrel end why dry fired and I've tried lubing the shiz out of it.

There doesn't seem to be any airseal issues, so could it be just that the hop up rubber and tightbore don't like each other?