What AR platform rifle would you buy if you had a huge supply of incredibly cheap 7.62? I'm trying to find out more details, but I believe its 147gr ammo, usually resides in links feeding a Dillon M134. Basically this will just be for fun, but Iwant to know it will function well, and I talked to a couple mfgs who said their rifles possibly would not cycle the 147 will in a 16-inch or shorter barrel. Also, should I be looking for something with a 1:11.25 twist. barrel, or is sticking with a 1:10 still going to perform better with this light of a bullet?