I started shooting NRA action pistol back in the 90's, and after graduating from my Browning High-Power to a Colt 1991, I chose (at friends and competitors advice) Wilson Combat 47D magazines. Bought them from a mail order company, Denny's Shooter's Supply, and they seemed to be expensive, but worked well, at first. After a period, they started to fail to lock the slide open on the last round periodically. I always felt that those mags (from the 90's, at least) felt thin and pliable compared to others.
After I became involved with Bullseye shooting with the Navy, I got in on a group discount buy (through the USNST) on Metalform magazines, blued 7 rounders with a metal, rounded follower and a solid, welded baseplate. Those worked and were cheap, like under $10 for that variation, in the late 90's/early 2000's. They ran well, including in tightly fitted NM pistols, which were sluggish when fresh from Crane.
I, myself, gave up on the Wilsons and stayed with the Metalforms, which were basically right up the street (more or less) from the Sub Base in Groton (their website now says Warwick, but I swear I remember them in Newington or Meridan?)
hey were cheap and worked, and I got a set of 8 later for my wife's 1991 (which she liberated from me after fairly full, 90's vintage customization) and another set for my Springfield stainless 1911 (which I bought to replace the 1991...) Both of these were stainless, with round top metal followers and rubber bumpers.
I always stayed away from 8 rounders, until a couple of years ago, when I tried a pair of Novak Acti-Mags, which ran flawlessly and never failed to lock the slide open, a problem with nearly all 8 rounders I had used in the past. I bought 6 more of those and they have all ran great. They are Italian, if I recall.