Alliant Techsystems Inc.

Rollie H Dohrn

Calvin T Candland

Dipak S Kamdar

An obturator having redundant surfaces for sealing between a projectile and a gun tube, where the obturator has at least one gun tube side cannelure. At least one projectile side cannelure is located opposite to the at least one gun tube side cannelure, where the at least one gun tube side cannelure is conformed to seal around the projectile. A tail protrudes from a rearward end of the at least one gun tube side cannelure, where the tail makes an interference fit with the smooth gun bore to make a low pressure seal.

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Cottage Grove, MN, United States of America

Rollie H Dohrn