Almost was a "five" - Mec-Gar S&W 5900 Series 915/910/695 9mm 10-Round Pistol Magazine

Even though it states that this magazine will fit a S&W 910, it would not lock up when inserted in my 910. I had to open the notch with a file a bit more for the latch to catch and hold it in place as the gun cycled. Other than that, it was a good buy!!!