I have a closet full of rifles and pistols that don't quite work I am going to send you.
I would welcome such a thing except for my concern that the jack-booted-thugs at the BATFE would come to my home, kill my pets and children, and burn my house to the ground while claiming that I was attempting to make one of your malfunctioning firearms operate full-auto.
Oh ... and I don't really have the right tools.
The first firearm I ever owned was a S&W 9mm pistol which wouldn't function correctly. I sent it to S&W and it still didn't work. It was a used gun and the dealer said he would guarantee proper operation. When I insisted that he take it back he was the most unhappy man I have ever seen in a gun store. I wish I had felt more qualified then to work on it. It's the only gun I have ever sold and I won't do that again.