Multi-fit training magazine - ProMag Smith&Wesson M&P 40 .40S&W 10 Round Pistol Magazine

I have an M&P 40 and also a S&W SD40VE, I use the SD40 as my Range Carry pistol, and also demonstration pistol for CCW Students. I discovered that the M&P mags will work in the SD40 but not vice versa. I bought 3 of these to try out. They work and function fine in the SD40 although the Floor Plate is a little askew, it doesn't affect function or grip of pistol. I quite often use a 9mm barrel in the pistol also. These mags will feed 9mm pretty well, with an occasional Fail to feed, due to feed lip gap adjusted to 40S&W, this allows me the opportunity to practice IMMEDIATE ACTION DRILLS. Factory 40 mags feed 9mm much more efficiently. I have 9mm mags fitted to the 40 frame I keep loaded with Defense rounds. I use FMJ ammo when demonstrating different tactics, I run the course of fire for students to observe live fire and what to expect. If I have a magazine failure, so much better for training (when loaded with 9mm). When loaded with 40 I have no negative issues as of yet. If you spend as much time at the range as I do you will appreciate having extra mags on hand. I assist 4 different CCW trainers, having extra equipment is definitely a plus!