safety catch
safety lock

He was looking for a safety catch, but there didn't appear to be one.

It has a safety catch at the rear of the slide.

Nothing happened - I had forgotten to release the safety catch.

She looked down at the gun in her hand, remembering what John had said about the safety catch, and raised it.

But the safety catch was on and I'm very sorry.

A man could lose precious seconds by using the safety catch.

He snapped off the safety catch and was ready to shoot.

I've got my finger on the trigger and the safety catch is off.

She looked at the safety catch and seemed to fumble with it.

Placing my thumb on the safety catch, I was ready.