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I know these are pretty rare now but how much would a maruzen aps2 with 4 mags upgraded laylax zero trigger, Laylax bolt handle, laylax piston and spring be worth?

I’m needing help from anyone that has one of these or knows what could possibly be the cause. The gun is hit or miss to whether it will fire, sometimes it’ll blow back once randomly after multiple cooking’s and trigger pulls but most of the time nothing happens. The strange thing is that it seems when I have the slide disassembly switch back the gun works fine?? Any ideas or help is welcome, thanks.