If you like projects AND carry handles try one of these:

https://www.brownells.com/rifle-par...-stripped-upper-receiver-prod124803.aspx

At $70 I got 3. Built one into a 16" mid-length, one into a 12.7 carbine length pistol, and not sure on the 3rd yet. They got some bad reviews but all mine have been in spec and fit all my lowers fine. Paired with a pinned front sight gas block barrel they make for a tough set up.

Here is my 12.7". It is a blast in every sense of the word
[Linked Image from i.imgur.com]