Walking Roll Pin

[WDW]

My bolt catch roll pin is backing out of my M&P15OR during firing. It has never actually come all the way out & requires force to put back in. Any suggestions? Could the pin just be undersized? It is a 100% factory gun.

[Odin Bravo One]

Very well could be the case.

It does happen on occasion.

[jmjames]

I don't know how comparable it is, but I had the same thing happen to my P30's mag release roll pin (it would be half out after 2 boxes of ammo, and always walk out in the same direction). I replaced it and the new one is doing the job great.

J.Ja

[SecondsCount]

A new roll pin should fix the issue. Roll pins are like springs and if not heat treated properly will loose their tension which sounds like happened to yours.