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I own two, both bushmasters. One is a heavy 16 inch barrell and the other has a 16" pencil barrel that I added. The weight of the pencil barrel makes it great for close up 3 gun matches. I would stick with a chrome lined barrel (easier care and less worry). Mine are both chambered in 5.56, which gives more ammo choices that being chambered in .223. I have over 15000 rounds through my 3 gun AR and the only failures were when I didn't clean it after about 2000 rounds. I use an Eotech and can second the posts on how quick and accurate it can be. I also have a backup iron sight mounted.
I like working on it, easy to do with just a few tools. Headspace is not normally an issue (i.e. for barrel change outs) as the barrel is threaded into the extension properly installed at the factory.
We shoot an IDPA like 3 gun match the second Saturday of the month at the ImpactZone in Brookshire TX (West of Houston) and they shoot a carbine only match after the IDPA match at Eagle Lake on the third Saturday of the month.

Bob W