At this stage it probably doesn't matter but if you need more magazines? Midway has had them on sale for the last couple of months. These are S&W factory mags. You can also use Megar mags. Also good quality. My 915 came with one Smith and one Megar and both worked well. I have added both types as found on sale and have no regrets.These are listed as fitting the Model59 but will fit many different Smiths, including the 915. I also have a couple of 411s which are the same basic gun except in 40 S&W. All great guns and underrated. I much prefer my 3rd gen guns to the M&Ps that I also own.