I am looking to purchase an AR-15 semi-auto rifle. Any advice on brands, calibers?

There's soooooo many AR-15 manufacturers, it's difficult to select; i don't know what's junk and what's good. I like my friend's bushmaster .223. I may get that cal. My local gun shop had a .308 AR-15 at a good price, but i had my reserves about the .308 - thought it may be a little... show more There's soooooo many AR-15 manufacturers, it's difficult to select; i don't know what's junk and what's good. I like my friend's bushmaster .223. I may get that cal. My local gun shop had a .308 AR-15 at a good price, but i had my reserves about the .308 - thought it may be a little overkill. Unless I'm snipe hunting bears i guess.
Thanks.
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