I have both the CM9 and the P290rs. Love 'em both.
The 290rs is heavier but that just makes the recoil softer.
The CM9 is lighter, recoils harder but I carry it more in the
summer due to it's light wt. Both have great, almost
identical triggers. If I had to chose between the two I'd
go with the CM9 ONLY because of something that has
nothing to do with guns. I like lasers, CT instinctive lasers
to be exact and CT does not make one for the P290rs.
SIG does make a laser but it's activated by a button on
the laser and not by pressure of the shooters hand. If it
wasn't like that, I honestly can't say which one I'd chose.
Glad I don't have to make a choice.
My P290rs likes a heavier bullet, shoots 147 gr Hornady
XTP best. The Kahr CM9 is the opposite. It likes the 115g
round best and shoots the 115gr Critical Defense like the
cartridge like it was made for it.
Remember the CM9 needs at least 200 round break in
time. Mine, on the last round in the mag for the first 150
would not reset the trigger. I could touch it from behind
and the it'd fire. The next 150 rounds I fired it worked
fine and has ever since. The SIG didn't need any break
in. I fired 100 rounds of mixed wts and power when I
first got it and it functioned flawlessly and has ever since.
Good luck on your choice. Let us know what you do.
Dano