Here is a nice video, "How a Glock works: Watch every internal part work as it fires!"
I shot about 400 rounds through the gun, hit the bullseye only 5 times.
10 is the bullseye, I usually hit 7 or 8. I'm using my thumbs more on the frame to help with recoil, it really helped me get more shots off & get back on target faster.
On head shots, I aim for in between the eyes, but I end up hitting the nose or mouth.
I shoot at 10 feet and 25 feet, same difference, I'm no better at 10 feet or 25 feet.
The gun store/range I go to dudes are buying rifles like crazy,
Remingtons, ARs, and Springfields often. They say they are hitting things 100 - 300 yards out. If a race war pop off, damn at going against these dudes with a hand gun.