I shot a season with an LTT and the mecgars worked on par with the older standard 15 rounders that came with the gun. I carried with those mags too, they were very reliable for me. The PVD coated M9A3 and USMC sand mags are genuinely my favorite handgun mags. If I could have that mag in all of my pistols I would. Stupid reliable and durable. One of the few things I didn't see a Marine find a way to wreck the shit out of.