I have a 20" flat-top upper. Is it possible to get the cut to 16" to use it for a midlength dissapator? I have A2 handguards and stock on it and an AFG, and I like the way it points and feels, I just am not terribly hot for how long it is. If I absolutely must shoot 20" I have a spare A2 upper for it.
What would I be looking at for price, and is it possible to move the gas-port with no effect on performance?