Guys, I am new to AR's as I mostly shoot bolt guns. However, I am planning to get my first AR and have a question about what would be better between a RRA Varmint and a Remington R15. I had originally planned on getting an R15 because of the lightweight/handling. However, I could pick up a Rock River Varmint 20" locally from an individual for $800. That is quite a bit cheaper than what I can get a R15. I know that the RRA Varmint is heavy, so I was wondering if it is economical to plan on getting the Rock River and then getting a lighter upper in the near future? Or should I hold off of a good deal and just get the R15? I am just concerned about using the Rock River as a calling gun because of the weight, but it will sure shoot. Your advise is appreciated.