The dimensions and profile of the magazine catches on the two mags I bought were not even close to the catch on the factory mags. With a lot of filing, I was able to get the mag fitted and functioning. I have not experienced any reliability issues with these mags vs the factory mags, but I have only put ~50 rounds through them so far. Fitting is a PITA, so I'm probably going to pony up for factory mags in the future, but these are a good option for people willing to go through the fitting process.