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Quoted:
...Can I use the same ammunition in the AR15 that I use in my Mini-14?...
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I don't think they do. I believe the mini-14 is only rated for .223 Caliber ammunition.
AR-15's however are chambered for both .223 cal, [b]AND 5.56 NATO[/b].
Though there are no differences in dimensions, 5.56 is the prefered round for home defense situations and longer range shooting, since it contains more charge than the plain .223. The Military uses 5.56 NATO. You can find out more about the ammunition isssue at [url]www.ammo-oracle.com [/url]
Personally, i'd take a AR-15 over a Mini-14 every day. Here's why:
Once you have one AR lower receiver, you open yourself up to a world of possibilities. you can easily convert it to almost every caliber imaginable. anything from .22LR to .50BMG([url]http://www.bushmaster.com/shopping/accessories/jac-008.asp[/url] and [url]http://server50.hypermart.net/50bmg/001.htm[/url]). and you can switch back and forth between them in a matter of seconds! Without the use of any tools.
From what i've seen, AR's aren't that much more expensive than mini-14's, but they're well worth it. ARs are far more rugged (just about every military of the free world uses them BY CHOICE), far more accurate (you're talking 1 inch groups as opposed to 13 inch groups with the mini14), and lightyears more advanced than most other firearm avaliable in the market today.
About the brand issue, Go with either Bushmaster or Colt. They are the industry leaders, and second to none. Personally, all my AR's are Bushmasters. With colt, you're paying alot more money just for the name.
I have no expenriences with Colt Customer service, but Bushmaster is outstanding. I've never been on hold for more than two minutes and they reply to your e-mail within two days tops. Check out bushmasters knowledgebase, you can learn a wealth of information from them. [url]http://www.bushmaster.com/faqnew/content_by_cat.asp?keywords=&do_search=1[/url]
Last but not least, with the purchase of an AR you join the brotherhood of Black Rifle Disease Victims. you'll find yourself coming to this board to exchange information and learn more about your newest hobby. We will be able to answer most of your questions and concerns.
Either way you go, enjoy, firearms are great fun!
Edited to add: Bushmaster offers a 1:9 inch twist which many claim does a better job stabilizing a wider variety of bullet weights, as opposed to the 1:7 twist offered in colts. You can learn more about this topic at the ammo-oracle link i provided above.