S&W M&P 15T rail/D ring wiggle

[goldwater58]

Recently purchased the S&W M&P15T

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And I noticed that right out of the box, the tactical quad rail (which is bolted to the D ring) can laterally twist a slight amount. I can twist the D ring/rail, but only to the point where the gas tube (which runs through the D ring) stops it from rotating more. It throws off the front sight which is attached to the rail. Is this normal?

I somewhat remedied the issue by attaching a low profile riser to bridge the gap between the rail on the upper receiver and the quad rail.

ARR-378 - AR-15 .5" High 5.7" Long 13 Slot Low Profile Riser Mount UTG Leapers Picatinny Rail Quick Detach Riser Mount

Is the D ring loose? Is it normal? Thanks for any input.

 

[wizard]

I am curious as to what the problem was? My guess is that the mounting bolts for the quadrail were loose or maybe the barrel nut itself was loose. I do not have an M&P in front of me and was unable to tell how the quadrail was mounted from the pic. I would have called S&W and asked them to fix it!