Night-Night Gun

The Night-Night Gun is a prototype tranquilizer rifle manufactured by SHIELD technicians Jemma Simmons and Leo Fitz.

Use
The "Night-Night Gun" administers a subcutaneous round that disperses upon injection, administering a dendritic, nonlethal toxin to the host. The proper toxin can cause instantaneous tranquilization, resulting in a nonlethal takedown that looks, on the surface, to be indistinguishable from a lethal shot.

Agents of S.H.I.E.L.D.
With the go-ahead from Leo Fitz, agent Grant Ward used this rifle to tranquilize the unstable Michael Peterson.