I bought a NIB Professional Ordnance Carbon 15 about 10 years ago. I shot it a handful of times when I first had it, and never had a issue. Well it sat in my safe for the last 7 years, and I took it out to shoot it, and it seems to have developed a issue with jamming. It seemed fine the first 20 rounds, and then it had a problem feeding. I cleaned it up and it tried it again today, but it started acting up again after 20 rounds. I think I just want to sell this gun, because I never use it. What is a fair selling price for this? I have the original box and manual.
-Mark