Re: Semi-auto prairie dog gun quest
I also have the 20" RRA Predator Pursuit upper. I built my lower with a JP rifles trigger, and lots of Magpul goodies. With 69 gr matckings, I can shoot 1/2" groups for longer range. I also have a load for 53 gr matchkings that is close to clover leaf, at least when I do my part.
The great thing about AR's and Pdoggin is that once you get setup on a mound, you can just keep shooting without having to change your position to operate a bolt, or look around for rounds.
I would look at some medium weight barrels, as I found the heavy 24" barrels made the rifle too "front heavy".
If you like your hunting rifle, you can keep your hunting rifle.