Continued efforts in improving the design and duration of StealthBucks seems to have hit a wall.  The MG StealthBuck II is the most advanced design we have managed, taking advantage of the same recharging magical properties we have introduced into some of the newer lines of magical energy weapons and possessing four times the duration of our original design.  However, recharging takes hours, and the duration still falls far short of our goal marks.

Fallout: Equestria Chapter 37