Gas handgun magazines usually contain 10 to 30 pellets in a standard-capacity magazine; however, some are high-capacity magazines and can hold 50 rounds or more. In the case of AEG rifles, magazines come in either real-capacity (equivalent to the 30-round capacity of its real steel counterpart), low-capacity (10-50 rounds), mid-capacity (75-160 rounds) or high-capacity (190+ rounds). These magazines have spring followers like in BB guns. The high-cap magazines often have a ratchet wheel that can be wound up periodically to force pellets up from the holding chamber of the magazine to the feeding chute. Due to loose pellets in the reservoir, they often make a rattling noise when running or walking. Some airsoft guns have a battery-powered box or drum magazine that holds thousands of pellets, but these are usually only used and allowed on LMGs (light machine gun) type replicas.