I was wondering which to get first, the rifle or the scope? I know it may obvious to some but, I was thinking on getting the rifle first. The rifle I plan on getting is an RRA AR-15 for varmint/target shooting out to ~500yds. The scope I was looking at was a Bushnell 6500 Elite 2.5-16x50. I just wanted to get other opinions on this rather than mine.