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Originally Posted by HOLLiS
On your magazines, are they the H&K steel ones with the black followers? Those are really great Magazines but not cheap.
H.
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There isn't any real information on these so I googled the Patent Number and came up with these results:
PAT.NO 4139959
United States Patent 4413437
Abstract: An improved cartridge magazine constructed of high impact nylon resin and in which a spring urged follower pushes cartridges into a rifle into which the casing is inserted. The follower is attached to the spring which prevents fore and aft movement of the follower and the spring is curved to physically contact the bottommost portion of the follower to prevent the follower from pivoting about the spring contact. A removable floor plate is removably attached to the casing by means of a pair of resilient latches. The floor plate is symmetrical and has no preferred orientation, thereby simplifying loading of the cartridges.
Inventor Howard; William J. (P.O. Box 573, Wilson, NC 27893); Harvey; William A. (P.O. Box 3065, Wilson, NC 27893)
Owner/Assignee
Publication Date February 20, 1979
Application Number 796560
Filing Date May 13, 1977
US Classification 42/50
Int'l Classification F41C 025/02
Examiner Jordan; Charles T.
Really these are The Thermold ones look for "Thermold D&D INC WILSON NC" on the left side. "PAT NO. 4139959" is on the bottom
I hope this helps.