I have never owned a Glock though I have shot them many times. I was never fond of the grip angle and the 3rd gen fingergroves sit on my large fingers rather than between them. I am a reloader and bullet caster and know the rep of the Glock barrels and cast bullets. WTS, my duty gun is a S&W 1006, 10 mm. I am the only one grandfathered in my agency to carry the 10mm. I want a light rail equipped pistol as I work nights and am handicapped with a 20 year old pistol. I have considered the M&P 40 and 45, but would like to stay with the 10mm if possible. The 45 is a good cartridge, but the 10 mm is a great cartridge. The 40 is weak to me. I have 40 caliber pistols and carry one off duty, but having the extra power and range of the 10 is comforting. I do not carry "sub sonic", " FBI lite" loads, I carry the full house Silvertips as Speer does not load a 10mm Gold Dot and Agency policy is Gold Dot or Silvertip. An M&P 40 gives me the versitility of switching to .357 Sig with a barrel swap and I like the ergonomics of the M&P. I still want my 10mm. The M&P 45 is, well, a 10 round 45. Not really gaining anything there. I have a coworker that has a new in the box G-20C that he bought several years ago on a whim. He is looking to sell and I can get a good deal. The Lone Wolf conversion barrels for .40, .357 Sig and 9 X 25 can turn this pistol into a do it all 4 caliber gun. My question is, does anyone have any experience with these Lone Wolf barrels? How does the .40 run out of the deeper mags of the G20? Is it truly a drop in and go proposition or does there need to be some tweaking? I can have a 4 caliber gun with 5 mags and holster for under a grand. I am almost a Glock guy.