Somewhat off the original thread, but the CS9D exist in both silver and blue. The 2 I have are both Double Strike Capable.
The blue is extremely rare - I have only ever seen one blue CS9D EKY75xx Product code 103886 dated by SW as year 2000 - Double Strike Capable.
Silver produced 2000-2009 observed S/N in TDP65xx-66xx Product code 103888 - 4 observed Spec Ord 9301 but Mfg Date per SW of TDP665x comes back 11/2000, EKY (2000), VJB-VJL (2001-2003), and 1 BDK99xx Spec Ord 9075 March 2009 perSW.
CS40D more common in both Blue and Silver (Mostly EKY + TDU, VJx, & BDH - 1999-2006 observed). CS45D rare - I have only seen 3 (VJC, VJJ, BAY) all Silver (2003 & 2004 observed)
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The difference is because the 3954 and 3953 were designed from the ground up to be double action only. The 3914DAO was a modification of the existing DA/SA design. That was designed specifically for NYPD as an off-duty choice. Using a carbon steel slide was most likely a cost decision to make the price more competitive.
Similarly there was a 457D made for Chicago PD. That was for off-duty carry and some detectives. There were two versions of that. One like the 3954 designed from the ground up to be double action. The other was a modification like the 3914DAO. There is even less information about that particular gun then there was until recently with the 3914. Which one won out the competition I still don't know.
Owning both styles I can tell you that the 3953 has a much smoother trigger action.
I have a PC3953. Only a few were produced. It has the older style "short" DAO without restrike capability.
I agree the "short" original implementation of DAO was easy to shoot. Less trigger travel required.
The trigger in the 3914DAO and CS9D is more like shooting a DA revolver.
Some will like that and some will not.