Hi all,
A while ago I did some work on my JG RPK. I replaced the stock hop unit for a combat union, purple prommy bucking & nub installed the combat union nozzle that came with the hop.
Cleaned out the v3 gearbox and re greased.
It has been great (around 2yrs) but has recently started having this weird issue where every 6th or 8th round out comes out like 60fps while all the others are around 330fps. Does it on full auto and semi. Have tried brand new mid caps as well as the drum mag I usually run on it. Any ideas what could be causing this?
Wondered if it is a hop issue? Nozzle? Tappet plate? Timing issue? I don’t know where to start?
any advice would be most welcome and appreciated ☺️
Thanks in advance
happy hunting