Hi there, first post here, but read some good info on the 10mm in the past on this forum. I bought a brand new Glock 20 3rd gen a few weeks ago and have now burned enough ammo through it to share my thoughts. It is my second Glock, first one being a model 17 3rd gen I bought in 2002. Have been buying and selling quite a few guns since then but it was only until last year I really felt like I needed a 10mm in my stable, and the Glock 20 seemed like the ultimate 10mm: durable, reliable, weather resistant, high capacity and good accuracy. And as a nice bonus it is kind of inexpensive when compared to other pistols that offer the same kind of power. The one I bought is apparantly made in June of 2010. I was thinking of waiting until the 4th generation of the model 20 came out, but this could easily take another year or two, and I'm not that patient. Besides, the upgrades are not that big of a deal, maybe the reversable magazine catch since I'm a southpaw, but then again I am used to using my left index finger to change mags and this works great for me. I don't shoot factory ammo since the cheapest (and pretty much only) factory ammo (UMC) costs 0,70/round where I live, this is close to one dollar for one round of 10mm. When I reload I can shoot 10mm for the price of the cheapest 9mm, so reloading is the way to go. I opt to shoot 180 grain bullets with a charge of Vihtavuori N105 magnum powder under it, making the 10mm a true magnum round instead of a slightly improved 40 S&W. I've shot 180 grain Frontier bullets and they do well considering they are cheap, but the Glock really starts to shine when shooting Berry's double struck plated bullets, they are very accurate and cost less than FMJ. The target in the picture is one I shot with those Berry bullets last week at 25 meters (27 yards) using both hands with a score of 95/100. My other scores are close but I haven't been able to duplicate that one. I only shot 100 rounds of Berry bullets so far, but I tend to say that when I do my part the Glock 20 will do +90/100 at a standard pistol target at 25 meters. The Frontier bullets which I have tested earlier gave me average results of 85/100, not really bad, but not great either. Regarding the Vihta N105 powder, I use 9,3 grains in combination with a plated 180 grain bullet and this will give the bullet 1220 fps from what I've read from someone else who chronographed this load (and this is also what the Vihta manual claims), this is close to 600 ft lbs. My old Vihta manual from 2002 says that I can go up to 10,5 grains of N105 for a velocity of 1338 fps (in a 5,5" barrel), but in my newer manual it says max charge is 9,9 grains for a velocity of 1280 fps. It seems like a habit of Vihtavuori to lower their charges over the last years. They also offer just one real 10mm loading, and that is the one here described, all their other data are basically slightly hotter .40S&W loads in a 10mm jacket. I reloaded my lot of 50 Starline cases (bought 2000 cases in total) 7 times by now and all cases remain in good shape. I know the chamber support of the Glock has been addressed a lot, especially for reloaders of hotter loads, and I don't know about those older Glocks, but my empty cases after being reloaded 7 times show no signs whatsoever of the typical unsupported chamber. I don't feel the need to hotrod my 10mm, the load described above is a true 10mm and will do fine for me. If I want to shoot some heavy bullets travelling 1500 fps I'll take my Ruger Super Redhawk. The only thing I changed in this G20 is the connector, because shooting in the winter at freezing temperatures outside, that 5,5 lbs trigger quickly starts to feel like a 10 lbs trigger. So I put a 3,5 lbs connector in, and this feels much better. For the rest I have no plans on doing any mods on this pistol. I did put a red dot on my G17 now because I was affraid I won't use it anymore now I got the G20. But with a reddot on my 9mm I got an excuse to use it more often, and it'll do well in the modified class of bowling pin shooting. It also seems that Glock equipes these more recent 3rd generation pistols with a slimmer front sight, which I really like because my biggest complaint about my G17 from 2002 is that the front sight is too wide for accurate shots at longer distances (+50yards). The finish on the barrel is also much nicer, a bit greyish, but overall much nicer. Interesting to see is how much bigger the slide walls of the G20 are in comparison with the G17, they are over 50% bigger. You hear a lot about how much bigger the grip of the G20 and 21 is, while the grip front to back and side to side is just about 8 to 10% larger than a normal Glock frame. I find the difference in the slide walls and slide mass much more noticable. This G20 has quickly become my new favourite. Sure, my STI's shoot a bit better (and look better doing it), my Super Redhawk packs more punch, my .22's shoot a lot cheaper, ... but there's just something about a 10mm that makes it stand out. I guess you'll have to own (and shoot) one to understand it.