The chapter mainly expatiate the gun management system based on the lock of the trigger,the lock of trigger has small cubage,low cost,and far control distance.

Velocity measurement equipment of underwater gun s automatic machinims;

The center of mass of gun is one of the most important parameter in the testing of gun,the offset between the center of mass of gun and the axes of bore will affect the precision of fire.

Principles of product data management require that bills of materials be formed in the department of gun design.

Cleaning and cooling occasions of firearms are the important indexes affecting their firing lifetime.

In order to investigate the rationality of firearm shooting methods instituted under military standards,shooting methods of all kinds of firearms satisfying the needs of tests and practices of actual battles were proposed on the basis of actual battle analysis and research.

When the motion of a firearms mechanism is known, graph theory can be applied to describe the features in such a multibody structure.