So I found these grip frames at a flea market today....

by Andrew , Bloomington, IN, Sunday, July 29, 2012, 18:50 (4297 days ago)

The price was right $3, for both. They were in a box of picked over loose rifle barrels and some airgun parts. They are steel, but are just castings, not drilled or milled.

Any clues as to origin?