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It can also be used to push out a retention pin in the side of the receiver for removal of the entire trigger assembly.
The Bar Receptacle features a retention pin that provides tactile feedback when the Token is fully inserted, and also helps keep the Token firmly in place during operation--standing up to the most demanding shock and vibration requirements.
HSS says its testing revealed the carabineer gate retention pins can inadvertently detach, permitting the carabineer gate to open.