Pretty much any M4 grip,including the magpul ones should be fine although any that have a extended backstrap will need some modification to the backstrap, grinding, sanding etc to the inside of the backstrap. I had a tango down style on one of mine and it didn't need to be modded. I modded a magpul one and it worked fine, but in the end I prefered the feel of the tango down when wearing gloves. As long as the grip sit's flat to the bottom of the mechbox ( you should be able to see this by looking inside the grip before you put the motor in) your alignment should be fine.
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