A "magazine" that has 300 rounds is not the kind that you read.
It is the magazine for some time of weapon.
A 300 round magazine would describe the capacity of the magazine. In other words, how many times the weapon can be fired before it has to be reloaded (change magazines).
The M4 3181 AEG electric rifle with M203 spring grenade launcher typically has a magazine capacity of around 300 rounds.
The max capacity goes to 300 rounds in one magazine.
A Glock 21 magazine holds 13 rounds, a Glock 30 magazine holds ten rounds, and a Glock 36 magazine holds six rounds.
The Mossberg 500A1 shotgun typically has a magazine capacity of 5 rounds when using 2.75" shells or 4 rounds with 3" shells.
Standard magazine- 13 rounds. There are optional 10, 15 and 22 round magazines.
Magazine capacity for the Model 1903 (.32 Smokeless Rimless) is 8 rounds.
The Airsoft M16 is a popular Airsoft rifle because it is lightweight and on the cheaper end of Airsoft guns. It also has a magazine capacity of 300 rounds.
13 Rounds.
The standard magazine holds nine rounds.
If you have a 30 round magazine for it, yes, it will hold 30 rounds.
The Glock 17 (full-size 9mm) holds 17 rounds in a factory magazine. The Glock 19 (compact 9mm) holds 15 rounds in a factory magazine. The Glock 26 (teeny-tiny 9mm) holds 10 rounds in a factory magazine. The Glock 17L/34 (competition) also holds 17 rounds.
The Glock 17 (full-size 9mm) holds 17 rounds in a factory magazine. The Glock 19 (compact 9mm) holds 15 rounds in a factory magazine. The Glock 26 (teeny-tiny 9mm) holds 10 rounds in a factory magazine. The Glock 17L/34 (competition) also holds 17 rounds.