The Echo1 UTG Upgrade Kit's metal piston isn't a 90 degree piston and
wears out much faster than PDI/Laylax pistons.
Aps2/type96 aftermarket sears are ideally made for 90 degree pistons so why Echo1 decided to make a 45ish degree piston eludes me.
Even the stock plastic piston is 90 degrees :ashamed:
I would highly recommend swapping in your stock piston for now, assuming you still have it in working condition, and see if that fixes any of your problems.
If everything is fixed at that point congratulations.
However, if the problem persists...
From what you described, it sounds like you may have an issue with the trigger box instead (or both).
- Is the bolt push forward smooth or very hard?
- Does it ever slam-fire?
- Are you using a stock trigger assembly with airsoftgi sears? If so, did you install it yourself?
I hope it's the piston because I was going to get a new one soon anyways.
Definitely. Which piston were you going to get?
My other question is about a bucking, I have the pdi W hold bucking in the pdi chamber, should I get another W hold bucking, or should I switch over to a systema bucking? Also should i get the pcs nub? will it work in the pdi chamber?
First off, do you have an AEG barrel? If you know for a fact you have an AEG
barrel then a Systema bucking+ PCS/SCS[same] nub will work. A PCS/SCS nub is highly recommended because it can maximally perform using only a few buckings and Systema happens to be one of them. Shredder--the maker of the SCS nub said it himself.
This is only from what I have encountered, but way more people use the Systema/SCS nub combo over any other bucking+nub combination. That doesn't mean it's the best, but many others personally prefer it. I'm using it, but I haven't had the chance to test many other combinations so I can't say it's my favorite. Perhaps my favorite at the moment
Any AEG bucking will work with any nub in the PDI chamber as long as you have an AEG Inner Barrel.
Just to make sure, what inner barrel are you using?