VSRs and it's clones aren't meant to be upgraded for power (wear annd breakage is a safety feature put in to maintain Japan's 1J limit), and good chance your sears and/or piston are worn to the point that slipping is occuring. So you'd really only have the option of buying new sears (or the expensive Zero Trigger) and a new piston.
PM Amos regarding your issues and find out what options you have, he's the resident VSR god around here (CA M24 is my expertise).
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