Videos tagged with Sear Notch

This guide explains the internal mechanics of double-action and double-action-only (DAO) revolver triggers, building on single-action principles. It details the roles of the trigger, hammer, hammer strut, and mainspring in both firing cycles, emphasizing the simplicity and reliability of revolver mechanisms. Instruction is provided by TheYankeeMarshal, who uses animated graphics to illustrate complex internal firearm operations.

This video details an FBI report investigating an uncommanded discharge of a SIG Sauer M18 pistol used by the Michigan State Police. The report highlights potential issues with sear engagement and the striker safety lock, particularly under specific stress conditions. The FBI's Ballistic Research Facility conducted extensive testing, identifying wear on internal components and demonstrating how certain movements could lead to the striker safety lock becoming inoperable, potentially causing the firearm to discharge without the trigger being pressed. The findings led ICE to cease authorization of the P320 for duty use.