Max 350fps for inside, so if it's more than that you either have to have a second gearbox and swap'em when playing inside/outside, or get a second AEG.
Barrel lenght does have an influence in airsoft, but 5cm won't make a huge one. Its range and accuracy will be influenced by: hop-up, barrel quality & diameter, and BBs.
Most MP5s are prone to have selector problems.
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