Hey everyone. I got a 686 no-dash and have the original box. Under the features, is has 2 letter abbreviations. They are as follows:
TS
CT
RR
WO

I am thinking that TS is Target Stocks. No idea what the others are. Any help will be appreciated!

RR is red ramp (front sight)
WO is white outline (rear sight)
TS is target stocks
CT is combat trigger ?

I'll assume JB is right about the CT...I certainly don't have a better guess. And congrats on a great purchase. My first handgun was a brand new no-dash 686. Still have it and still enjoy shooting it as much as any other gun i own.