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Old June 11th, 2013, 13:59   #2
Spike
Privateer Airsoft
 
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Join Date: Dec 2008
Location: Beaverbank, NS
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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