Is this the UTG clone thingy?
If so, don't bother. You'll be so depressed at how crappy it is that you'll wish you just left it alone and never looked.
That said...they're easy to take apart...just go for it, no magic. Simple lever trigger/sear mech setup. Dummy-stupid piston/spring setup.
If you are looking at putting in a stiffer spring...I'd caution you to look at how the piston is being retracted and how fragile the linkage is.
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