OT: Gun Question

[kalos72]

I was thinking bout signing back up for the Army soon and I was wondering if you guys might know of a good rifle that I can buy in the states, hopefully as cheap as possible, that might give me some good practice.

I am looking for some thing as close to the feel/design of the M16 as possible to make it an easier transition. Last time round I was an average shot because I had never fired a gun before. I want to get some practice in this time around while I get back in the gym and shape up.

I live in FLA if that matters...

Suggestions?