The back sight fell off my new cm9 I tried to repair with Loctite it also failed within days, I retuned to Kahr they installed new sight and returned in 5 days, faster then I expected. The first sight was so loose it would simply slide out either a poor manufactured sight or the dovetail cut too large.
The new one appears tight, aside from this minor problem the cm9 is the best small auto I've owned, accurate excellent trigger and fun to shoot.
For the money difficult to beat and the customer service was excellent.