Which side of rifle? M&P15OR

[js_paddle07]

Regarding the retention thumb nuts on risers, sights, etc...which side of the rifle do they need to be on? Does it even matter?

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[cyphertext]

Have always mounted mine to the left side, especially if they were near the ejection port, but doubt it really matters.

 

[WR Moore]

Or, you can buy sights, risers etc that don't need/use thumb nuts.