I've been researching the hell out of this subject for a year and a half.
1. The M&P definitely has feeding issues. Not all of them and some people who have a defective one have been able to fix them with new mag springs and by polishing the feed ramp. Some people have not had good luck trying to fix them.
2. The Sig Sauer X-10 has feeding issues and then theres the drop fire issue. When some of the guns are dropped onto the back of the slide it goes off.
3. The Glock does not have a fully supported chamber in the barrel. This results in "Glock Smile" or Glock Swell" and goes by many nicknames. When shooting P+P ammo the brass is able to expand where the round is not supported. Some glocks have been known to blow up because of this. Look up glock smile, glock swell, glock chamber support, glocks blowing up. All youtube videos.
Also, glock octogon barrels allow lead to build up when shooting hard cast bullets creating dangerous pressure and allowing blow ups. Look up glock octogon barrels and barrel replacements. Again on youtube.
4. That brings us to Springfield XDM Elite.
This gun has passed the "10,000 round shooting test." As seen on youtube. It is optics ready. It has a fully supported melanite barrel and can shoot any bullet. Hard cast, copper, lead and anything else. You can get it in 4.5 inch barrel or 3.8 inch barrel. The 4.5 inch barrel has a mag capacity of 15 rounds. The 3.8 inch barrel has a mag capacity of 10 rounds but you can get the extended mag that holds 15 rounds. Look up all of these 10mm guns on youtube and you will learn what i have learned.
The #1 winner is Springfield xdme.
The #2 winner is M&P. Its true some of them have feeding issues but if you are shooting at a charging bear and the gun jams you still have a chance to unjam it. Or as last scenario throw your gun at the bear.
Glock and Sig tie for last place. The Sig has feeding issues and might go off if you drop it on the ground or in your truck. You might get shot. And Glock might blow up in your hand which would give a bear a good place to start eating his appetizer before moving on to the main course.
FN-510. All reviews i've seen have been good but i have not seen extensive testing on it like i have seen on the other 4 name brands. Good luck with your choice and let us know what you get.
Fatrascal.