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I think the "U/Min" is how fast the motor turns. That is quite fast, despite its diminutive size.
Thanks, Wurger & Elvis. So what does all this mean? Is my little motor the ammo feed motor for an MG-131? That would be very good, since we have an MG-131. We could display the motor with the gun. ..... No the coupler from the first set of photos does not match the shaft end on the little motor. The coupler is half the size of the entire motor. Here's a picture of the 2 pieces together, so you can see the relative size.