I am looking at the Sig 220-10 and I see that they come in SAO and SA/DA.  What are the advantages of each and the negatives. 
Tom

The following link provides a good breakdown: http://patheyman.com/choosing-handgun-what-kind-trigger-action-updated/

I just bought the Sig Match Elite in 10 mm Auto; it is SA/DA with a decocker.  I have grown up with SA/DA semi autos and have become very comfortable with them. At some point your decision will be based on that with which you are most comfortable. I feel most safe with the SA/DA hammer weapons.

Good luck with your decision.

I have the DA/SA model.  But I was already used to that type of action by my P220 .45acp and my P226 9mm. 

With SAO
> Hammer has to be pulled manually for first shot
> All shots first thru last have the same trigger pull (weight and travel).
> If a round is chambered and the hammer is back then you should keep the safety engaged to prevent an accidental discharge - I believe this is where the term "cocked and locked" came from.
> I believe the hammer can be lowered (uncocked), but that requires both hands to do it safely - I would defer to someone else is they have the SAO model.   You basically grab the hammer and pull the trigger and slowly lower the hammer down

With DA/SA
> Hammer can be manually pulled back for first shot (this provides a light trigger pull - effectively makes it SA) or just pull the trigger (pretty heavy trigger pull) and it will cock and release the hammer when the trigger 'breaks'.
> In DA mode the trigger has a long heavy pull.  In SA the trigger has a much lighter and shorter pull (since at this point the trigger is already cocked.
> Round can be chambered and the hammer can be decocked by using the decocker - this is the safe way to render the pistol 'safe' with a chambered round.
> There is no manual safety.   The DA trigger pull and what is between your ears is the safety as far as this pistol is concerned.  So there is nothing to disengage once you have the pistol in your hands.

Thank you for the replies.  I am new to auto pistols but have been shooting revolvers, Contender/Encore and single shots for over 50 yrs.  I have the Browning 1911 380 so I am familiar with the SAO.  The SA/DA seemed to make more sense to me but I have read reviews where they said that they hated them and would not buy anything that was not SAO. I figured that I must be missing something.  I am 71 today and I think that I need a birthday present.  The use will be target and hunting.  Have either of you seen the Hunt Ready model?  I understand that the introduction was put on hold to work out problems with the red dot.  I was wondering how the red dot was mounted and if it could be added to the current models. 
Tom   

Any mount made for the P226, and there are several by Leupold, Burris and others, will fit the slot on the P220 allowing a red dot to be mounted. You have to remove the rear iron sights first, of course. As for the action I've carried with both types and always planned on cocking the DA/SA before firing it as the long trigger pull on the DA side would work for a target about five feet or less in front of you but otherwise cocking the hammer is the way to go. Thus, in practice, the two types become quite similar in my estimation.

Pro/Con depends on use.

If your use is for defensive carry, then there will be a difference in the trigger pull between 1st and 2nd shot with the DA/SA.  SAO is nice and consistent.

Flip side, the first shot SAO is right there.  If you are in a tense situation the probability of an un-intentional discharge goes up.

I carry 1911's quite often.  A Para was my EDC for years.  Not a problem as long as you train for it.

Same goes for DA/SA.  Before the 1911 I carried a Tanfoglio Witness DA/SA.  Not a problem as long as you train for it.

If your going to use this pistol 'primarily' for hunting, a SAO may be the better choice 'trigger-wise'.  Hickock 45 does a nice review of the SIG 220 on Youtube.  Personally, I prefer the DA/SA iteration of this pistol.  Since, I use my pistols also for a 'personal defense' mission.   

I have to believe that this gun has raised a ton of interest in 10mm firearms. I once again searched the Internet  for a couple hours tonight for the DA/SA version (SKU 220R510RTASMSE) and no one has them in stock. There are not even any on Gunbroker. But I'll find one soon to add to the collection.

I just checked and the Cabela's in Fort Mill SC has at least one.   

Maybe another Cabela's - if that is an option for you, not sure of your area - close to you has one.

Unfortunately there are no Cabela's in Florida.

Quote from: PCFlorida on January 03 2016 07:01:58 PM MST
I have to believe that this gun has raised a ton of interest in 10mm firearms. I once again searched the Internet  for a couple hours tonight for the DA/SA version (SKU 220R510RTASMSE) and no one has them in stock. There are not even any on Gunbroker. But I'll find one soon to add to the collection.

GB gets them up there. Seems to go in bursts, not sure if a function of Sig production schedule or demand (like now could be a holiday thing). But, you can normally find them in the $1200 range when they are up there. Cabela's locally has normally had it in at $1299. Be patient, one will find its way on GB before (too) long.

There is one at a gunstore near me for 1179 in NIB.  Black Nitron SAO.

Quote from: sqlbullet on January 04 2016 07:16:44 AM MST
There is one at a gunstore near me for 1179 in NIB.  Black Nitron SAO.

I think he was looking for the SA/DA version, which is about $100 more expensive normally and harder to find.

How does the red dot attach?  Is it a rail mount or slide mount?
Tom

Yes, I am looking for the SA/DA version. Before I made my mind up to buy one there were a number of them on GB, Tombstone and Bud's. A week later they were all gone