SAO, one in the tube, hammer down?

Yes, the 4506 has a decocker. Cannot carry cocked and locked obviously. But the first shot is DA, so you don't have to worry about cocking.

I personally think a decocker on a straight SA auto would be a very bad idea.

Tom

Why would you do that? If you are uncomfortable with a cocked and locked gun, I recommend a different style weapon. (My striker fired S&W M&P .45 suites me well, so does the Para LDA and I carried a TDA 645 for 15 years--great gun.) If you really like that single action trigger, but are still uncomfortable with cocked and locked carry, then carrying with an EMPTY chamber is even safer, more fumble resistant and gives you that light, crisp target trigger you may be looking for.

PS
Most stock, original 1911s are NOT safe carried with the hammer down on a loaded chamber and just might go off if you drop them just right ("just right" means the muzzle will probably be pointing right at your, ehem, lower body).

Most stock, original 1911s are NOT safe carried with the hammer down on a loaded chamber and just might go off if you drop them just right ("just right" means the muzzle will probably be pointing right at your, ehem, lower body

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This is absolutely categorically false, and had you actually read the posts prior to yours in this thread you would know exactly why that is so.

Sorry to get curmudgeonly, but I really really dislike it when folk continue to spread false information when the data they lack is literally within their grasp.

You will not get a 1911 with an in-spec firing pin spring to discharge from a normal drop, nor can you get a drop onto the hammer to cause a discharge if the hammer is decocked fully.

I have a old Colt left over from Vietnam. The safety is so easy to disengage that I carried it with the hammer down for years. I finally bought a Kimber SIS, so the old Colt became a safe queen.

I agree that cocked and locked is the way to go, but if you want something that is made with condition two carry in mind, check out Detonics.

Guys:

It's a Single-Action (SA) trigger mechanicsm, not a Single-Action Only (SAO) trigger mechanism.

The trigger mechanism does one thing - it drops the hammer. To describe it as "it drops the hammer only" is redundant and implies it can do more than a single-action.

The proper term is SA.

It's a Single-Action (SA) trigger mechanicsm, not a Single-Action Only (SAO) trigger mechanism.

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Splitting hairs?

You can use both and i will know what you're referring 2.

There are pistols that can be had both ways like the Sig Sauer line and SAO is perfectly acceptable as is SA and DAO.