Ok so I am looking at ar15's what are good brands? I'm mainly looking at a plinker an some once in awhile small game shooting (nutes, coyotes bunny). I'm looking at 5.56 in a 16" barrel. Also would prefer a flat top so I could add some optics eventually. Another feature I would like is the adjustable stock so my lady can adjust it to fit her! I would like to keep this rifle as cheap as I can! Suggestions would be great!