Traffic at GOC is less than the 'nutty' place, people can be apprehensive about peoples with zero feedback or whatever it is called here. This is what I am experiencing at GOC, right now. I am using the Marketplace to list my new items as I was disappointed in the Moderation of CGN. Take good photos if possible, no toes, runners or socks in the photo. A plain gray background works well, avoid placing your item on the expensive Persian rug, cammo cloth or that nasty star wars bedspread. Be honest with your description, and try to answer all the questions from serious possibilities. I did not see what brand of AR it was you were trying to sell. Many buyers are searching for high end stuff at Import (not USA) prices. AR's are like a custom Harley, what you like may not be they way the buyer wants his ride. Part it out, if its good stuff and fair price it will go.
good luck with your sale and enjoy GOC, the less NUTTY alternative.
Had a look at your ad, photos are fine and the price is right, sadly some peoples dont like the brand as they didnt stick to the standard milspec uppers and lowers.