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10/21/2007 10:45:04 PM EDT
I think I picked up some old (late 60's early 70's) 20 round military M16 magazines. If anyone can help me confirm this I would appreciate it.

The floor plates are marked:

M/16 M16A1 CAL.5.56mm
UNIVERSAL INDS. DIV.
SIMMONDS PREC. PROD. INC.
WEST HAVEN, CONN. USA


They also have what looks to be an S over an I inside of a square box just before the wording starts and a U with an I in the middle of it on the front edge of the mag. They also have dull alum. followers.

Anyone know if these are indeed early US Military mags??

Thanks,
                         
10/21/2007 11:10:22 PM EDT
[#1]
Check this link out for info on various types of AR15 mags.  

AR15 mag FAQ

This link has a lot of usefull information.

All Colt-marked magazines were actually made by a sub contracter, Universal Industries, a division of Okay Industries. GI-Contract Colt 20s had alloy followers and are marked with a "UI" stamp (for Universal Industries) on the front narrow wall of the magazine. Tilted on it's side, the "UI" becomes a "CH" (Colt, Hartford). The US Military switched to 30-round magazines in the early 1970s, and Colt-marked 20s made after the switch had black plastic followers. Anodizing is generally gray or silver in color.

Simmonds Precision Products Incorporated
-------
Army and late Air Force contract mags made by Simmonds. Dull alloy followers and gold/bronze colored anodizing. (Simmonds was a division of Okay/Universal Industries). Made from 1966-1971
10/21/2007 11:29:53 PM EDT
[#2]
Looks like mine are indeed US Military mags from 1966 to 1971 then.....cool.

Thanks
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