Patent ID: 8485083

Claim:
A single-feed magazine adapter used with a dual-feed twin-drum magazine and automatic or semi-automatic firearms requiring a single-feed arrangement of rounds, said single-feed magazine adapter comprising: an elongated hollow feed-tower member having a lower non-tapered end sized to hold two adjacent staggered-array columns of standard ammunition rounds contemplated for use in the dual-feed twin-drum magazine that is intended for attachment thereto, said feed-tower member also having an inwardly-tapering top portion having a central feed opening therethrough sized to allow one-at-a-time exit of the contemplated standard ammunition rounds therethrough; a lead specialty round associated with said feed-tower member and positioned so that when all contemplated standard ammunition rounds have exited said feed opening, said lead specialty round stops at said feed opening, said lead specialty round having a circumferential groove that extends fully around it; two follower specialty rounds associated with said feed-tower member and positioned so that when all contemplated standard ammunition rounds have exited said feed opening, said two follower specialty rounds each stop adjacent to said lead specialty round in a remote position from said feed opening, each of said follower specialty rounds also having a circumferential groove that extends fully around it; and a flexible and extendable linking member associated with said groove in said lead specialty round and also associated with said groove in one of said follower specialty rounds, said linking member configured to provide interlocking pendulum movement causing standard ammunition rounds between said lead specialty round and said feed opening to rotate and move, allowing conversion of the standard ammunition in said top inwardly-tapering portion of said feed-tower member from a dual-feed arrangement to a single-feed arrangement during their forward advancement toward said feed opening, said linking member further preventing said lead specialty member from exiting said feed opening, preserving pre-load tension in said feed-tower member for faster and easier reloading of the dual-feed twin-drum magazine attached thereto with ammunition rounds.