14.5" Mid length was the thing before AR pistols became legal in free states. Now what's the point of a 14.5" barrel when you can just do 8, 10 or 12 inch?
I have one as well but the primary driver was to get as short as possible a barrel without triggering NFA rules. Now that motivation is mostly gone with pistols and shoulderable braces being legal.
Now demand for shorter uppers has gone through the roof.