Is my ammo corrosive?

[Hecklerusp45]

I have some 5.56 ammo that the box says was made in Portugal. The headstamp reads FNM up top and 82-10 across the bottom. Before I shoot it in my new AR, I have to know FOR SURE that it is not corrosive. If anyone can help me with this, I would be grateful.

[Johnny in Texas]

It should have a NATO ⊕ marking also berdan primed '82 non-corrosive

[Tuna]

Non-corrosive for sure. Enjoy shooting it.

[Dave in NGA]

Not only is it non-corrosive, but the brass is excellent. I've gotten better than six reloads from some I bought back in the 80's.

[Johnny in Texas]

Thanks, I thought it was berdan primed