SIG SAUER Disconnector - Semi. Using a Sig Sauer Disconnector Semi when firing your piston-driven weapon is a much safer method than using an improperly fitted connector that can lead to a lack of reliability. Another name for a disconnector is a buffer or spring and both are used to prevent your bolt from cocking when you release the trigger. Simply select the Sig Sauer Disconnector Semi that works for your situation and switch it in for a better-functioning gun. Package Contents: SIG SAUER Disconnector Semi SIG SAUER Infinite Guarantee SIG SAUER 1702456-R: Disconnector - Semi