People often refer generically to all gun switches as Glock switches, like using the brand Kleenex to refer to any facial tissue.

New Jersey and Minnesota sued Glock on Thursday, calling on the gunmaker to stop selling firearms that can be adapted with dime-sized switches to fire up to 1,200 rounds a minute.

in which the trigger can be held down and the gun will fire continuously. “It’s called the ‘Glock switch’ for a reason,” Scott said, referring to a street term for the sear, which ...