I bought a stag m4 carbine a few years back for a cqb rifle. I decided a while back that I wanted to try to build an accurate long range rifle that I could use for varmint hunting and target shooting. Then I read about the 6.5 Grendel and decided I could use it for deer hunting also. Well, I have put together and completed the lower, stag lower, a2 stock, NM RRA trigger. I have also purchased a bushnell 4200 4x16x40mm scope and a LaRue Tactical spr-s mount to go with it. I am ready to buy the upper but wanted suggestions as to which one. I was wanting to have 1/2 m.o.a. accuracy. I will probably not be shooting paper any further than 500 yds. Hunting 300 yds or less. The upper I have been looking at is the AA Entry with 19.5 inch barrel. Is this going to give me the accuracy I desire?Should I invest in equipment myself so that I can assemble my own upper with a match grade barrel? Or, is there another upper I should consider? Your suggestions would greatly be appreciated. I have about $1000.00 in it so far and would like to keep it below $2000.00 overall.