I have three magazine which have a .22 long rifle adapter in them.
They came in a silver envelope marked:
Remanufacture Magazines Cartridge
I know the contract date is 1978 and the manufacture date is Feb 82.
These magazines came with a .22 long rifle adapter that works in an M16 and my AR15.
The only marking on the blow-back .22 adapter is 107626 RW.
I haven't used this thing in years but am curious as to what if any documents might be available for the adapter. Obviously, I don't have any docs.