magazine filler

magazine filler

[¦mag·ə¦zēn ¦fil·ər]
(ordnance)
An item which attaches to the rear top portion of a rifle magazine to retain and position a cartridge clip to facilitate loading.
References in periodicals archive ?
With the magazine filler in place, push with your thumb on the rear of the top cartridge until all 10 rounds are below the feed lips.