box, manual, two magazines, owner's manual, cleaning rod
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.
Glock 23, IMO.
Yes, a Glock 19 9mm magazine can be used on a Glock 23 since both firearms are chambered in 9mm.
Call the manufacturer they will most likely send you one. The number is on there website. Or you can visit an authorized glock dealer they will give you one. (Local gun store that sells glocks)
Yes
The KJW Glock 23 only can use KJW Glock 23 magazines. You can buy these from amazon.com for 15 dollars.
No. Because a Glock 26 is chambered in 9mm, as a Glock 23 is chambered in .40 s&w. For example you can use a Glock 22 (full size) in Glock 23 (compact) and in Glock 27 (sub-compact) But you cannot use Glock 27 mags in Glock 23 or Glock 22.
Contact Glock and they will send you a manual for free. You can also download one from the Glock webiste.
You will need to call Glock
You cannot just swamp them out no.
Check your owner's manual or call Glock.