The term "Jungle Style" usually refers to the practice of taping or securing two gun magazines together, with one taped upside down while the other is inserted into the rifle. However, a rifle may also be jungle styled by using plastic divider or cradle in which the two magazines sit, usually upright. A Jungle Style configuration is used to speed up the process of reloading, since the other magazine is attached to the exhausted magazine, as opposed to being in a pouch, or other ammo storage unit. Also, some firearms manufactures have designed their magazines with studs that allowed them to mate together without the need of tape or clamps, such as the Heckler & Koch G36 and SIG SG 550.
The practice of "Jungle Style" magazines was developed during World War II with the introduction of 30-round magazines for the M1 Carbine, M3 "Grease Gun" and Thompson submachine gun. With the introduction of the 30-round magazine for the M1 Carbine. It was so common for the troops to tape two magazines together to speed reloading, that the U.S. Military introduced the "Holder, Magazine T3-A1", aka the "Jungle Clip". This spring-metal clamp holds two M1 Carbine 30-round magazines together without the need of tape. This practise was henceforth called "Jungle Style".