chad, are the mags you got the Wilson Combat ETM (Elite Tactical Magazine) mags? If so, they are stainless steel.
Do yourself a favor and call Aaron (877)837-9445 at Tripp Research.
Tripp Research Gen II Cobra Magazines
Tell him canebrake sent you and you have made a grave mistake in buying the Wilson ETMs. Buy one Gen II Cobra Mag for your 1911 and do a side by side comparison. If you don't agree that the Cobra Mag is twice the mag as the Wilson I will buy it from you including the shipping to and from you!
Yes, they are that good! And I bet you will be buying more Cobra Mags after this test!
In the photo below you will see the Wilson Combat EMT p/n 500B (Black) .45 ACP, 8 RD. ETM Tactical Magazine, Price: $36.95 (p/n 500 stainless $34.95)
sandwiched by two Tripp Research Cobra Mags p/n 8R-45-RG .45 ACP, 8 RD. Magazine, Price: $32.95 (photo shows mags with optional alloy base pad)
Notice not only the quality of the welds but the fit and finish of the final product.
Notice the fluid stampings of the Tripp mag on the left and right. The .45 case head sits square against the back wall of the Tripp mag, the Wilson is rounded and forces the round forward when it presents for stripping. AND, the Tripp mag feed lips are CNC finished.
This photo shows the slide stop interface. The Tripp mag on the bottom uses a hybrid follower with a metal interface where the Wilson on top uses a poly follower interface. The Wilson shows witness-marks where the slide stop engages the mag when empty. This mag is six month old and speaks volumes as to this critical area.
As a retired engineer, this is how my mind works while looking at new products. When a company makes guns and mags that go into them, the mag becomes an area where they can cut production costs. When the company only makes mags, their entire R&D budget is used on mags. Think about that!
If your 1911 mags have poly followers be sure to check them each time you load. Should this area wear out, your slide will not lock open when empty!