| 摘要 |
A firearm employing a cartridge magazine includes a laser sighting device or other electrical accessories attached to the firearm. A power supply is located in a housing in the lower end of the cartridge magazine. The housing has a hollow battery compartment in it with a pair of battery contacts in it. One contact is electrically connected with the cartridge magazine. The other contact is a spring-loaded contact coupled with a conductive lead to the laser sighting device or accessory. An on/off switch, preferably in the form of a push-button switch, is engaged by the user when the firearm is in use.
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