This mod has been integrated into the following mod. It is thus no longer supported here as a seperate mod.
Epic Syringer Rifles Cartridges and Grenades plus Chemistry Overhaul
http://www.nexusmods.com/fallout4/mods/4121

Jigging with a combat rifle to make the new medic rifle!!
No more slow reloads after every shot with an old syringer pipe rifle. 
Join the army medic corps today in providing frontline utility in disabling the wasteland.

You can build it at any chemistry lab.

If someone could fix it so the nice green glowy thing shows that would be great but otherwise you get a nice short rifle that you can mod up.
Please note that with F04edit, i cannot currently specify the spawn parts, which is related with the s_xxx keyword i think, as the F04Edit doesn't update the value input for the properties input section, hence i am stuck with integers and cannot add properties that utilize keywords. Hence, you may notice some odd spawn bugs with combat rifle parts, just equip the modded parts at the workbench and there should be no problems whatsoever.

You may also try some of the syringer ammo that has been cooked up for the wasteland here.
Fun Syringer Ammo: http://www.nexusmods.com/fallout4/mods/4121

Planned Updates.
- Hunting Rifle Addition

This will complement the existing faster fire combat rifle with a slower firing hunting rifle. Thus your rifle upgrade tiers will be as follows.
- Pipe Syringer
- Hunting Rifle Syringer
- Combat Rifle Syringer

Tweaks to the advanced barrels and suppressors will be made to reflect advancement by Bethesda, in terms of mod quality.