I have 2 official Namco Guncon2 guns that i don't need anymore. Work great, i had them working with mame .129 and Wingun driver. I hooked up my generic guns that have recoil, so i don't need the namco ones anymore. Very accurate. I have also have the dual cable for running 2 guns inputs to the TV.
Sold as is, i will not spend time telling you how to hook them and configure in mame. The information is out there, you just have to search for it. I've posted the various configurations in some of the threads that worked for me.
Asking $40 plus shipping. (What i paid for them)