Magnum is a high torque option
Turbo is a high rate of fire option.
Go for the one you think you'd want more performance in that area, although, IMO, both of those options are at extreme ends and unless you're cranking a heavy spring or looking for crazy rate of fire, there are other options that meet in the middle.
You may want to consider the Eagle Force Hummer 1300 instead.
Keep in mind that a high rate of fire motor will draw more battery power due to the reduced torque.
And yes, AK47 is short motor length
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