Gavin, I have been looking very closely at this MVP family of rifles for awhile. When you get into the details, they are very well thought out and have many nice attributes besides just taking AR (5.56 & 7.62) mags (though doing that reliably is a very good attribute). The adjustable triggers are supposed to be very nice.
Since I will always have more 5.56 (and mags) on hand than anything else, I want a 5.56 rifle. And I like the laminate stock
Predator much more than the polymer stock
Flex or the
Patrol. But it is not just the stock material.
I like the idea of a collapsible/adjustable stock on the
Flex, but I do not think that a pistol grip is very compatible with a bolt action rifle. Since they will take a larger capacity mags (30 or 20s on the 5.56), I view this a combat rifle, and to keep it on your shoulder while working the bolt rapidly, I think having to bring your hand all the way down to wrap around a pistol grip, then all the way off to work the bolt, back and forth between shots, will be more time consuming (and not so very ergonomic) than using a conventional stock. Now if you are looking at it as a hunting rifle with only the occasional shot, then the pistol grip would be fine. I otherwise really like pistol grip rifles and riot shotguns, and to the extent a pistol grip could interfere in a prone shooting position, so will a big magazine. And of course, a bi-pod on the front sling swivel can fix that nicely.
I also want an 18-20" bbl, not a 16", so the
Patrol is out. Not that a 16" bbl loses all that much push or accuracy in either 5.56 or 7.62. (and I already have a 16" M4-type AR)
Now the Predator comes in a Varmint long bbl, heavy stock model too, but that is too heavy, and I like this one best with the 18.5" bull bbl. Many laminates are too brightly colored for me, but I think this is beautiful, and the roughed-up rather than traditionally etched grab parts are good too (
but this is what I like for my purpose, not necessarily best for yours)
http://www.mossberg.com/product/rifles-bolt-action-centerfire-mvp-series-mvp-predator-mvp-predator-185-medium-bull-barrel