Sadly I currently don't have the time to work on this mod :(
In the meantime if you are looking for a working version Pi-C has one Here.

Feel free to copy/clone/make your one version etc, no attribution needed I'm happy to share :)

Sniper and shotgun Turrets, Uranium shotgun ammo, and more to come.

--------------------- change-log ---------------------
1.1.0 - 00/12/2017
Added:
- Sniper Gun.
Updated:
- Gave the Shotgun Turret +1 range.
- Moved Technology for Sniper and shotgun turrets to the turrets tech.
- Changed Sniper and shotgun turrets max health.
- Removed the MIT licence I hade on it and moved it into the Public Domain (The Unlicencse) learn more at unlicense.org
- Some general mantenence.
Removed:
- Some useless code.

1.0.0 - 18/05/2017
Added:
- Uranium shotgun ammo.
Updated:
- Updated this mod for Factorio v0.15 from my (unpublished) Factorio v0.14 version.
- Some general code maintenance.
Removed:
- some 'work in progress' stuff that will be released when finished.
Note: This (1.0.0) is the initial public release.