This is not my mod. I am reviving it for 1.1. All credit goes to the original author badway. https://mods.factorio.com/mod/gun-sn

You need to unlock military technology and a new recipe will be available.

Specifications:

Sniper rifle
Long range - 36;
Rate of fire - 1.33 per second + bonus rate of fire technology;
Damage bonus - 500%.

Ammo damage:
Physical - 8 + bonus from technology;
Explosive - 5 + bonus from technology;
Fire - 4 + bonus from technology;
Store size 25;
Cartridges are made immediately by 100pcs/30sec.
Thank:

GeneralTank for his fix to get the mod working.
The author of the German language kingmax007.
The author of the Finnish language Aidan647.