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barrel length is for grouping, you can get the same range out of a M4 CQB than you can an M16A2, but the short barrel on the M4 CQB will cause the bb to veer off course more easily. If the gun shoots 380fps then it shoots 380fps no matter how long the barrel is.
I've got a G3 with a 469mm tightbore, shoots about 380fps and rivals sniper rifles in range, but I have a lot of internal parts upgraded which affect range (piston head, cyl head, cylinder, nozzle, etc)
and like everyone else says, you'll need the bore-up kit for a 650mm barrel.
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