Falling-block action

Ruger No. 1 single-shot falling-block rifle in .243 Winchester with custom barrel with action open.
See also: Firearm action § Dropping block

A falling-block action (also known as a sliding-block or dropping-block action) is a single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the weapon and is actuated by a lever.[1]

  1. ^ Westwood, David (2005). Rifles: An Illustrated History of Their Impact. ABC-CLIO. p. 60. ISBN 978-1-85109-401-1.