Before the this year’s test began, I asked SACS about magazines and they recommend the Springfield (Metalform) 9rd mags that ship with the pistol. They also endorsed the Metalform 10rd magazines which were designed in partnership with Springfield’s own Rob Leatham. But I checked out various online discussions and spoke to people with far greater 1911 experience than myself and had some other brands recommended as well. As such, I had a quantity of three different 10rd magazines to begin the test: Metalform, Tripp Cobra magazines, and Wilson ETM magazines.
The Wilson magazines performed flawlessly in the gun. However, for some reason about half of them consistently would not allow me to load more than three rounds of Blazer (either 115gr TMJ part number 3510 or 124gr TMJ Cleanfire part number 3460). The cartridges would bind and no amount of force — even using an UpLULA – would allow another round. At various times with other ammo the mags would also bind trying to load a fourth round, but stripping all the cartridges from the magazine relieved the problem and I could then load them with ten. This fix never worked for the Blazer, though.
The Tripp magazines worked fine during the initial day’s testing but then some randomly began having issues. They were substantially harder to load to full ten round capacity. But more importantly, the feed lips were allowing rounds to pop free. I had rounds strip from the magazine when pulled out of the gun, when dropped on the ground, or even while trying to load them up.
The Metalform magazines (link goes to Midway USA as Metalform’s own site doesn’t provide any useful information) all worked without any problems whatsoever. They’re easy to load and tested well with every kind of ammunition. As such, I’m getting another dozen of them and will be using them exclusively for the time being.
Train hard & stay safe! ToddG
You can also follow and discuss via the pistol-forum.com 2012-2013 Endurance Test thread.
Previous Springfield/Warren 9mm 1911 Endurance Test posts at pistol-training.com: