I can't compare to the XCR, but I love my 556. The poster above is right though, the factory BUIS are crap. Plan on spending some money on optics. I went with a Samson Mfg. front sight (drifts on) and an ARMS #40LP rear. I put a Trijicon Tripower in on a Leupy quick-release ring between them. It shoots anywhere from 1.5 to 2.5 MOA with bulk ammo. I haven't run any match or precision hand-loads through it.
The 556's forte is shot-to-shot speed. The recoil consists of a tiny jitter, and you're right back on target. Close quarters double-taps are super-fast. You'll find that at 50yds, you can empty a mag as fast as you can pull the trigger, and your sights will never leave the target. It's just wonderfully manageable. It's heavier than an AR, but this is offset by how controllable the rifle is. Multiple rounds in the same target are faster than any combat rifle I've fired in semi. The trigger on it really surprised me. It's the best stock trigger I've fired on a combat style rifle. (I do have some aftermarket match triggers on ARs that are better, as they should be).
As for reliability, this rifle has eaten anything I've run through it. And I've fed it some crappy ammo. The receiver does get marred by the ejected brass just behind the ejection port. It doesn't bother me, but I have heard some folks complaining about it.
Another thing I've noted with the rifle is that it REALLY flings the brass. I mean, if the round doesn't get your attacker, the brass might be just as likely to take him down. I've had brass thrown 35 feet. And yes, I reload, so it can be a pain to try and find brass that's been throw seven benches down the line. Also, it dents the case-mouth of every round fired. The dent is severe, but not so severe that it causes a crease, or isn't ironed out cleanly by the resizing die. But I use that dent to determine if it's indeed *my* brass that I'm picking up at the range.
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