The Bronco is a .22 LR survival rifle made during the late 1960s and 1970s. They were marketed with the slogan “without frills”, which was, if anything, an understatement. The Bronco was essentially a copy of the Hamilton Model 7 which was made form 1889 to 1901. For most of its life the Bronco retailed for less than $20.
To learn more about this gun read the article written by Dan Shideler in Guns Illustrated 2011.
Thanks to Chris for the photos.