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Yes it's perfectly normal. I've never had any negative functional issues related to this. A bonus is that every single mag I've used in my XCR's drops free.
Mine is definitely very generous, but it feeds from every mag I have tried and everything drops free. I think they just decided to make it really big because everyone uses Pmags nowadays, much to Robinson's distaste.
If it was tight you'd be pissed that some of your mags don't drop free.
They have to make things like the magwell a little loose to ensure that your rifle will function with all brands of magazines.