I bought the M&P 15-22 about a month ago and today I picked up its bigger brother the M&P 15 Sport. 
I notice a little play between the upper and lower on this rifle that isn't there on the 15-22. Is this anything to be concerned about?
Picture with the 15-22 and my Gerber LHR

I notice a little play between the upper and lower on this rifle that isn't there on the 15-22. Is this anything to be concerned about?

Picture with the 15-22 and my Gerber LHR

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