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You should be fine as long as you're not MS'ing.
I've used my credit card before to buy gift cards as gifts. Shouldn't be a problem - I've used my Sallie Mae card before it was nerfed to buy $300 worth of gift cards from Target when they were on sale for 10% off. No word from Barclays yet!!
You wont have any problems whatsoever.
I believe the only time buying gift card would be an issue is buying the the type that can be transfer into cash (Visa/Amex). Some stores will not even accept a CC payment for that type of GC. Buying specific store gift card should not be an issue.