Don't think that SIG isn't feeling the heat from the demand created by inexpensively produced plastic pistols.
Yes, they created their SRT sear to better compete against S&W 3rd gen TSW's (according to what we were told in a SIG Classic Pistol armorer class in the mid 2000's).
Notice how SIG has become sort of a "gun of the month" maker, similar to what S&W was doing with their metal pistols when the commercial catalog still contained 3rd gen guns? Gotta do something to keep attracting the non-LE/Gov buyers, right? Finishes, styling, model variations, etc. Bottom line? Prices are getting up there, aren't they?
Also, they've been trying to get their own plastic pistol models up and running well enough to try and win some contracts. Don't be at all surprised if the plethora of expensive metal-framed SIG's eventually give way to a new "flagship" service pistol, or models, at some point. Less costly to produce, support, maintain and train armorers to service & repair.
Not surprising the newer reps may not have been around in LE work when the 3rd gen guns were still in-service in big numbers.
You have to admit it guys ...
As much as some older, longtime owners & users of the S&W metal-framed TDA pistols (and the fewer numbers of DAO shooters

) might be willing to pay $1000 (and
more) for a new TSW ... the guns we'd all buy wouldn't come close to generating the sales - let alone
profits - of the markets being willing to buy - and
demanding - plastic guns.
If the Houlton plant has to make handcuffs, .22's, PPK's (for Walther's US sales) and 1911's, any machine time spent on a 3rd gen/TSW is time that can't be spent to make the other guns actually
in demand, right now.
Like it or not, if it takes approx 85 seconds for Glock to pop out a completed frame ... and it takes 30 minutes of machine CNC time to make a 3rd gen frame ... how can S&W compete in the
time-is-money lucrative service pistol market? (S&W's M&P frames are made by a long time vendor of plastic parts, so it saves them factory time and manufacturing space, BTW.)
I remember the last time some lightly used (one agency's T&E) factory LE .40/.45 TSW demo guns became available, and they were offered at a 1-time deal ranging from $600-$700/each. There are some folks on this forum who would quibble about paying that much for a used gun that wasn't pristine, guaranteed only used by the little old lady from Pasadena, and also complain about the lack (or type) of a box which came with the gun.
Metal guns are expensive to make compared to plastic guns. It's not like the company hasn't looked at their market demographics, reviewed sales figures for both private & LE/Gov buyers, cost of support, etc and made their decision.
Do you expect to see Glock get into metal-framed pistols? How about HK?
If S&W had been selling their TSW's faster than they could be produced, and for a price which offered them a reasonable & sustainable profit margin, they'd still be making them.
More's the pity.