Hhmm...nevermind my previous post. From Chuck Hawks:
As a result, changes have been made to the Model 94 design. The top ejection, which threw the empty cases basically straight up and over the shooter's shoulder, has been modified to permit conventional scope mounting. The so-called "angle ejection" became standard in 1982. A bit of the top right side of the receiver was milled away and the internals slightly modified to throw spent cases out at enough of an angle to the right to clear a centrally mounted scope.