Bare with me guys, i just purchased my first AR-15 a Bushy m4 kit and am awaiting my EA lower. When i finally do assemble my rifle i want to put a rail system on it but i dont understand the abbreviations and such. could u guys break it down for me and tell me which is a good system. thanks

Here ya go:
[url]http://www.ar15.com/forums/topic.html?b=3&f=12&t=147348[/url]
Probably all the info you need is here.
And welcome to the AR fever!