That’s a helical magazine: the Calico M900 (VIDEO)

Designed in California of all places, the Calico-series featured a top-mounted 50 or 100-round magazine as its hallmark.

One of the neater guns as far as practicality — as well as one of the few to successfully use a helical-feed magazine — these sprang from the line of the Calico Light Weapons Systems from 1982 onward. Although their marketing was stymied for about a decade due to the federal assault weapon ban, they are back in production.

In the above “I Have This Old Gun” segment, ARTV takes a look at the now-classic Calico Carbine. And speaking of American Rifleman, the NRA Museum has a very special Calico M900 in their collection. Note the serial number.

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