Broken mag spring(pull down part)
 

Im not sure what you actully call it but its broken I was firing the gun and it got cold when I slid it down to put more bbs in I let go by mistack and it snaped off. the gun is a Kjw glock 23 pictures of the mag are below. I was woundering if it was posible to buy a new part or do I have to get a new mag. if I can buy a new one where and how much might it be. Also does anyone know how possably open it up so i can replace it or make a modifaction to the broken one.
Picture 1
Picture 2

Does the KJW Glock mags have the same type of baseplate that slides forward to expose the fill valve? If so, you can remove the plate completely and knock a pin out (KSC is like that) that you can pull out the spring base, spring and follower (that is the part you broke, the follower). A fix? Well, if you have access to small set screws and a tap/die set, you can drill a small hole in the follower, tap it for a #2-56 or #4-40 set screw that is short enough to sit in the groove without interferring with the action, that itself will give you purchase to pull the follower down to load the mags.

The valve on the KJ is exposed on the bottom. No sliding baseplate to show it. I've owned two of them.

so I can't open it the way he said. Thanks for the help CDN_Stalker. Another option is to buy a new mag but I havent seen anyone selling any.