My Magpul M&P15 edition.

[BIGLEW]

Heck yeah. Like fixing something fragile with a hammer. If 3 mags don't loosen her up, shoot 3 more.

Eventually, something's gotta give

 

[mtdawg169]

I've seen several NiB bolts that wouldn't lock up or were very difficult to unlock from the barrel extension. It's now out of spec due to the additional thickness of the coating.

 

[sinac84]

Eventually, something's gotta give

That's what I was thinking.

 

[DogLegArms]

Did you get the stock BCG Nib coated?