I recently picked upa pair of NMV's from Longhunter, and they are also a tad loose as you describe. They are a tad looser than the OMV, Blackhawk, and Uberti MP's that I have, but they shot fine a couple of weeks ago and were fairly accurate. Didn't paper shoot them, but was hitting the metal plates consitantly. I'll have to benchrest them and check the accuracy next time out. They did open up the forcing cone on the ones I got - maybe that helped.
Anyhow - back to the point - yes, mine are also looser than my OMV's.