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Analyzing the friction between the bolt carrier and receiver assembly in amphibious rifles is an important problem to study the dynamic of automatic mechanism in amphibious rifles. In this paper, the influence of material, normal force, surface roughness and firing environment on the friction between the bolt Carrier and receiver assembly in amphibious rifles is carried out by using experimental method. The result of this research can be applied to dynamic analysis of automatic mechanism and design the amphibious rifle.
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