I just spent an hour reading about the two similar options out there... Both the XCR in 7.62 and the 556R have way to many bad reviews if you ask me. I think there is a reason Robinson isn't listing the 762 anymore on their website.
The 556R will not shoot Wolf ammo nor will it accept a steel mag without doing obvious damage to the weapon over a short period. I did read the one review from Warrior Talk that stated it would shoot anything in terms of ammo, but I have read many noting failures. Plus, Sig says they will void your warranty to shoot steel casing. I think I will stick with my ARs for now. I really wanted a fighting rifle in 7.62x39 that would run steel casings if necessary, but that doesn't appear to be a possibility at this time.
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