I've been researching quite a bit into which upper I want for my AR-15 and I've narrowed it down to going with RRA, but now I am in a bind on which one to buy. It is between the 20" Predator Pursuit, the 20" NM A2, or the 20" Standard A2. I am planning on buying from Pete from AR-Sales. Money is sort of an issue, but I would pay a little extra to suit my needs. The use of gun will go from walking mountains and shooting squirrels and rabbits, calling coyotes, and just shooting targets. I am also eventually planning on eventually switching out the handguards for whichever one I end up choosing and getting new handguards and rails. So in your opinion which one of these guns best matches my use and price range?