David, The TP9SF is a newer iteration of the TP9SA without the slide mounted de-cocker. Both have great triggers.
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Anonymous
Answered
David, the TP9SA has an ambidextrous Decocker built into the Slide just before the rear Sight (It's the black button pictured here in front of the rear Sight) : google.com/search?biw=1280&bih=595&tbm=isch&sa=1&ei=CIVHXb-_ApLU5gKrjIPwDA&q=canik+TP9SA+decoc
