i am a novice to ar15's so please bear with me. i am in the process of building a m4 rifle. i have found several preban rifles from which to start with, 6601 blue label, 6530, 6551 sporter tgt, 6520, 6530 sporter lightweight. does the lower make a difference, which of these would you recomend and why. now for the m4 upper, i would like it with a removeable handle, and have found several. is there a difference in types of m4 uppers and what should i be looking for. recommendations and why? i want to put together the best m4 i can, money is second only to the quality of the rifle. thx for the help and sorry if i wasnt specific enough but this is about all i know.

Pocket, welcome to AR15.com. You might get more replies if just post this in the "Build It Yourself" forum.

Jamie