Purchased this Upgrade with my UTG L96. The purchasing the gun with the upgrade worked well, they did the work on the gun and sent out my order within a week. It would be nice if they included the spring they were going to use in the details of the upgrade, as when I took the gun to the field, it crono'ed at 485. I was hoping to get into the 510 range, and I'd like to pick up another spring, but I'm unsure which one to get to step it up.
After the upgrade, you can really feel the difference in the bolt pull from a stock setup.
After 2 games, I was doing some shooting with the gun while camping and the trigger assembly fell apart. I don't think this was a craftsmanship issue, just that the stock trigger assembly can't take the pressure of the upgraded spring. I sent it back and had them put a Zero Trigger in it. Fires very smooth now, we'll see how my next game goes!
Work was pretty quick.
Marked improvement in FPS.
Accuracy seems better to a certain range.
Will likely break your trigger box. Consider getting this upgrade along side.
Doesn't specify the spring being used (Just MK96 Upgrade Kit, which also doesn't display the spring used)