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To this day, not all guns have a safety switch. Installation of such a device was never mandated or required by law.
Here's a few examples to demonstrate this point.
Colt Single Action Army revolvers have never had a safety switch since the design began to evolve back in the blackpowder era surrounding the Civil War. Exact copies of these guns are still in production today.
They even had a safety flaw. All 6 chambers could not be safely loaded at the same time, - as a blow to the hammer would fire the round under the hammer! Thus the old West six-shooters were actually five shooters, as wise cowboys left their hammer down on an empty chamber. Like I say exact reproductions of these guns are still in production, flaw and all, in some models.
Double action revolvers do not have safety switches either. The heavier Double action trigger pull acts as a safety mechanisim in these guns.
DAO, (Double Action Only Automatic Pistols), also have no safety switches on the standard DAO models. They again rely on a heavier trigger pull for safety.
The lack of a manual safety mechanism does not make any of these guns less safe in the hands of a trained individual. It is the gun owners experience and training that ultimately makes any gun safe or unsafe, regardless of mechanical additions placed there in an attempt to aid the situation.
In the USA, everything is possible.
