The top tech Mp5s are one of the easier ones to work on. The AR series is a pain.
Do you want to keep the blowback? If not, then you'll have to modify a standard cylinder a little bit to fit the gearbox... it seems to be a bit short to fit a regular cylinder.
an M100 or 110 spring will put you in the FPS margin you want.
I would recommend not touching it till it breaks... unless there's an area of performance that you're really not happy with.
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I change primaries like other people change socks.
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