Usually ammo pouches- until they are placed in the magazine well of the gun.
Yes.
Yes.
if by standard guns you mean the silver ballers, then yes, they are one of the most customisable guns in the game allowing you to carry 2 instead of 1. add laser sights and silencers, extended mags etc.
Unless the mags are a safety color, I'm pretty sure it might get confused as a real one. So yes.
it depends on what mag its using. Ak-47s use several different mag systems including drum mags, banana mags, etc. a banana mag holds about 30 depending on what type of mag you buy as a drum mag holds 75 rounds and another type can hold 40 rounds hope that helps!
Generally most m4-style guns have interchangeable magazines with other models and brands. Check your specific model to see what it can accept.
It's a bracket that holds guns.
On certain pistols and rifles, yes. You'd need to see if you can buy C02 mags for the certain gun you have.
Cro-Mags was created in 1981.
No
No. The mags for the 9mm are different than the mags for a .40 S&W
30 in Standard mags 40 in Extended mags 75 in Drum mags those were the common mags, there are also custom 60 round mags that look like 2 standard ones back to back that form a half-circle shape