The article deals with the motion of the breech block copyright and the weapon casing of an automatic weapon mounted on a flexible carriage and the base of the weapon. Earlier works. which did not consider the dynamic properties of the base of the weapon. did not allow to reconcile the calculated and experimental results of the weapon casing displacement when shooting from firing rests. https://www.roneverhart.com/Cleglaw-s-Tooth-West-Ladder/