You cannot buy different sized shotgun magazines. However, I suggest getting a shotgun that takes airsoft shotgun shells. It will expand your options of bullet capacity.
This all depends on the country where you live. Check with the local law enforcement agency.
The KJW Glock 23 only can use KJW Glock 23 magazines. You can buy these from amazon.com for 15 dollars.
Magazines for airsoft guns hold and feed the BBs into the gun's firing mechanism. They come in various capacities and styles to suit different types of airsoft guns and players' preferences. Regularly maintaining and properly loading magazines is essential for consistent and reliable performance during airsoft games.
AirsoftRC.com sells extra magazine's for this gun. Go to M06A1 airsoft gun magazine
Some magazines will not work with speed loaders, but most standard magazines do.
Depends where you live. In the UK a website called airsoft world sell scopes, sights, magazines and tons of other stuff. In America I'm not really sure. The majority of Airsoft websites sell accesories to go with the guns they sell. If you bought it from a shop then go back to the store and ask. Airsoft world: (see the link below)
No
By it off of airsoft megastore
Most airsoft guns have magazines that you put bbs into just like you put real bullets into a real gun's magazine
A person can buy airsoft rifles from an airsoft store, gun store, and a sport store. They are all reflective cheap in every store depending on the model you wish to buy.
At the left handed airsoft store.