I did the very thing that these fellas are warning about. My wife wanted to get her concealed carry permit, went and picked out the gun, PM9, figured the slide was just stiff and needed a good breaking in. NOPE, after about 400-500 rounds that thing was still tough to bring back, the wife really had a tough time so off it went.
My other Kahr was a TP9, the extracter fell out, So I sent it back, then sold it to my brother who wanted it, same thing happend to him, so he sold it. Great customer service though no questions asked and back in a very good time. Second time no shipping was paid to send it back. Other than that, accurate little gun, might have just had a lemon.
Good luck
Dave