I have had problems with the tack welded Nork mags (usually come with the 18.5" shorties). Sometimes the tab is a bit high or low, which can cause feeding issues in some rifles....
The bad ones seem to show up once in a while.... Not often enough to call it "regular", but somewhere around 1 in 20.....
But I would try them, I am usually able to match a dodgy mag to a rifle, and they may be absolutely fine!
Cheers!