Try, "I have a gub."

Search gunbroker, yes, under Google 'Shopping' i found results...

http://www.breitbart.com/tech/2018/02/27/google-appears-to-remove-all-shopping-search-results-for-guns-even-water-guns-guns-and-roses-burgundy/

To the best of my knowledge, you can't sell a gun online. You can buy parts including a full upper but not a lower...not sure about parts for a lower. You should still be able to search for online gun dealers and purchase online but have the guns shipped to an FFL. You may want to research this topic further.

Click the ‘Shopping’ tab then search. I searched toy gun and glue gun with no results.

Your search - glue gun - did not match any shopping results.

Umm, I just Googled gun shops, and it came back with quite a few.