Obturator sealing means for a split wedge/breechblock gun

摘要

An obturator for guarding the primary sealing surfaces of a step wedge breechblock gun from post-firing residue buildup assures greater survivability of the obturator without the necessity of cleaning after each firing. The device includes an active tube insert for facilitating face seal force multiplication, out of bore lip and face seals, an inbore piston polymer with expanding residue guard, and an out of bore face seal with a residue-tolerant polymer.