I have never owned any of the really high capacity pistol mags. I have several 20 round Mec-Gar mags for the Browning Hi-Power. Also several of their 15 round in addition to a few original Browning 13 rounders.
I do have one 30 round mag for the Browning. It has no markings at all but is reliable. I once showed it to one of the magazine vendors at a gun show. He looked it over and agreed that it was high quality. His best guess was Argentine military.
I also have several of the Argentine military 15 round ones. The spring is so strong in them that I leave them loaded hoping the spring eventually gets weaker. I have to use a mag loader to get the last few in.
The Mec-Gar seem to be among the best.
Agree ....Mec-Gar magazines are the best. I use em in my Browning High Power as well also the 18 round mags they make for the Sig P-226. Excellent reliable mags.....
My BHP is a early 80’s Mk III that I sent to Cylinder and Slide for custom action , combat trigger, magazine safety removed etc ...Still carry that rig for concealed carry some times....extremely accurate.
Argentina P=35’s are an awesome firearm. BHP’s / P-35’s take a deep bluing very very well.
Love mine.....