** Shares of defense firm Kratos Defense & Security Solutions' KTOS.O rise nearly 5% to about $71 premarket
** Jefferies upgrades rating to "buy" from "hold", maintains PT at $85
** Brokerage says co has upside to its revenue outlook, led by faster hypersonics growth, expanding missile propulsion opportunities and steady demand for microwave electronics from defense programs
** Says KTOS has strong growth potential as rising Valkyrie production, backed by solid demand, could lift revenues and profits well above co's base expectations
** 17 of 21 brokerages rate the stock "buy" or higher, 4 "hold"; their median PT is $121- data compiled by LSEG
** As of last close, stock had fallen 11.3% YTD
(Reporting by Apratim Sarkar in Bengaluru)
((Apratim.Sarkar@thomsonreuters.com))