Goranco,
I have had a model 21 for a couple of years and I shoot it in competition. The trigger does take a bit of getting used to if you have been exposed to triggers on 1911 style pistols. There is a certain way to quickly get off a second or successive shot on Glocks. Hold the trigger to the rear after the gun fires and completes it's reload cycle. The trigger then only has to be moved about 1/8 of an inch forward to be "recocked" and it is now ready to fire again.
If you are planning to protect yourself from a variety of animals that put you on the lunch menu, I strongly suggest going with the .45 ACP over the 9 mm. Specifically, hollow points of the 230 grain variety. Just my opinion, but bigger holes tend to make the liquid inside come out a bit faster. The .45 has a capacity of 13 rounds in the original magazines where the 9 has 19 rounds. Six more rounds might help if you were surrounded by more than 13 targets, but capacity should not be a major part of your decision. What should be is how well (read accurately) you can shoot each weapon. Pick the one that you can hit with. Just as in competition, in real life misses count against you.
As far as dependable operation, I have only had one jam in about 5,000 rounds and that was on an old magazine that was purchased used. When I took it apart, it was full of crud and apparently had never been cleaned. Cleaned it up and replaced the spring and it now runs just fine!
Good luck with your decision. IF you want more information on Glocks, check out
Glock Talk at
http://glocktalk.com
DblTap
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"...What will you do without freedom? Will you fight?... Fight, and you may die, run and you'll live, at least a while. And dying, many years from now, would you be willing to trade all the days from this day to that, for just one chance, one chance, to tell our enemies, that they may take our lives, but they'll never take our FREEDOM!!!"
[This message has been edited by DblTap (edited November 18, 1999).]