Depends on how much the gun was fired previously but in any case your looking at around 375 to 409 dollars
No, they are different calibers. A Glock 17 is 9mm and a Glock 23 is .40 S&W. A Glock 22 magazine would fit in a Glock 23.
300 or so
Yes, the glock 23 and 32 and the 31 and 22 magazines are interchangeable.
The price of any used item(s) can vary from seller to seller.
No, the Glock 22 barrel has an outside diameter that is larger than the hole in the front of the Glock 17 slide. your safest option is to buy a Glock 22 and a 9mm conversion barrel for the 22 slide. Then with the correct magazines you could use either 9mm or .40 S&W in a single frame and slide.
See link below to GLOCK 22
I just bought one for $499.00.
200-400 US Dollars
Glocktalk.com or you can call Glock
Depends on condition, accessories, etc.. Price range from 250-500
Contact Glock and they will send you a manual for free. You can also download one from the Glock webiste.
A new Glock 22 typically runs about $500. A used Glock 22 in excellent shape can range from $350 to $600. Everything really depends on the generation it is, condition (which should be perfectly fine, i mean it is a glock), if it has any extras, and if it is police issue or not. I would say a police issue in good shape would probably be worth $500-$600 easy.