A few things
1. LOADING PLUS 1 - Load bullet in mag; insert mag; rack one in chamber; remove mag; load another bullet; reinsert. Didn't know that i could've chipped the extractor. Talking to a few other people, they didn't know either.
2. Glock barrel conversions - too many to list.
3. Good people with a wealth of knowledge. I would do research on this web page before buying ANY gun.
4. I don't know much.