I spoke with a large STI retailer today who suggested either Dawson or Wilson 2nd gen mags as being the most reliable for fast mag changes. They said the Tripps were good mags but sometimes would have feeding challenges if slammed in abruptly, which dislodged the first round forward in slide lock back reloads.Have you experienced this Steve?
If you compare the Tripp mag to the factory mag you will see where you need to remove a little material. It's a simple fix with a dremel and the mags will run flawless with the Trojans.