The ATI CS9 is a very well made gun imported from Turkey. Imported by American Tactical Imports in New York, made by Tisas and/or Trabzon in Turkey. As I understand it, this brand of gun is the standard issue for the Turkish military and law enforcement.
I bought the gun on clearance at a local gun dealer. I was initially there to buy a Springfield XD, but was drawn to this gun for several reasons -
All metal - The frame and slide are all metal. The only plastic is the grip and the Plus 2 adapter of the Mec-Gar mag..which is the second thing that attracted me. The magazine holds 20 rounds with the adapter.
Third, the ported barrel. Fourth, double action with de-cocker.
Fifth, accessory rail. Sixth, the price.. I paid $289.
It is a solid, smooth shooting gun with a good grip. Compared to other 9mm guns I have shot (such as Ruger, Taurus), it is very much more accurate. I would recommend this gun to anyone.
The downside - Replacement magazines. I have yet to find a replacement mag. I have contacted Mec-Gar and they said I would need to contact the manufacturer or distributor for replacement mags. Nothing yet. I did discover that the mag tube is identical to the Sig P226. However, the retainer slot is in a different place and won't quite work. I was able to rack a few rounds by holding it in while working the action.
Another downside, holsters. Generic holsters are fine, but molded plastic or leather are hard to find without having one custom made. I found that the Blackhawk open top leather holster for the XD fits well and the Blackhawk Serpa for the Sig P228 works great too.
Overall great gun.
One other note - There is actually a factory fully automatic version of this gun. I've only seen videos and I'm not sure if it is available in the US..