AR .22 Conversion Mags

[Thrash1982]

I found these two magazines at a gun show today that said they were for the Air Force .22 practice kits. I assumed that they were for the M261 kits (bought one from a member here a while back). When I got home I tried them in my rifle and they didn't work.

Does anybody know what these mags are for? I bought two of them for $13.00 a piece.