help me make some final AR-15 build choices

[Ligito]

Uh oh, sharing the bills.
I hope you are not sharing a bank account.
BTDT

 

[Kevinkris]

yea, i wish, she's got way more money than i do. lol

 

[Kevinkris]

okay then, i got drawn back into the AR crowd and made the plunge. sold my handgun today and got a complete PSA lower with a mag but im still in need of an upper. one down side is im torn between 5.45 and 5.56 ammo. met a guy today saying he doesnt have any trouble using his with standard parts and USGI mags but everything i find to reference says everything has to be finely tuned and thats simply beyond me. so im thinking 5.56 is the safe bet but if i can get 5.45 to work properly, it is a better caliber.

anyone have experience with 5.45 in their AR?

i'll probably be going plain jane with the rifle for a while but if its practical i think i would like to get it in 5.45 when i get it in my budget to do so. any thoughts?