z-5 omega and revolution 1

[davey]

my buddies, first time muzzlers, are getting a z-5 and a revolution 1(cost $250 each, i recommended sidekick for best low cost) - what is difference between omega and z-5 besides cheaper sights and why is revolution 1 not highly recommended ( with knights great barrel) , is revolution II better shooter?  They will be using pyro pellets, what is a good accurate bullet/powder combo for them to start    any ideas?

[elkstalkr]

Only difference between the original omega and the z-5 are the sights.  Oh and the z-5 has a silver trigger/hammer action.   

Personally I prefer the old omega sight because it is fully click adjustable, unlike the "bump and guess" williams sights they put on the z-5.