I bought a Sigma .40 a few years ago. I put around 1400-1500 rounds through it. I fired it in 100 degree heat, snow and rain. Not exactly a lot of rounds compared to some of you guys but bullets are expensive. I had zero problems. My bro has it now and he has fired a few hundred through it and no problems. I bought a S&W MP45 full size. I liked it, no problems only 200 or so rounds. I needed something to carry so I traded it for a pretty much new Sig P250 compact 9mm. Shot about 50 rounds and did not like the trigger at all. I traded that plus $100 for brand new Glock G36 sub compact .45 Slimline. The Glock is awesome. It shoots great. I can only imagine the full size 21 shoots even better. The only thing I dont like about the 21 is the grip is fat. I have not shot one though. I do plan on buying a Glock 19 or 17 sometime because 9mm is cheaper to shoot. I also want a G21 or 1911 or both because I like the .45. I also want an AR15, the Waffen Werks AK54r, and on and on.