The Goodenow CO2 powered Challenger Plainsman Rifle 1954

Advertising flyers courtesy Dean T Fletcher.

Challenger Arms Corp. Plainsman.
Promoted in the Oct 1949 issue of "Science & Mechanics".
The sealed valve unit was quickly replaceable and the dual capability model could be used as a CO2 gun or a multi-stroke pneumatic. What a pity the Plainsman wasn't a success!
A genuine rearsight-that I don't have!