
Well let me correct you. The Disco trigger is VERY easy to modify into a very nice trigger.
I disassembled mine, smoothed all the bearing surfaces with a dremel tool and a cloth polishing wheel with jewelers rouge. I then moly lubed all bearing surfaces and pins and replaced the trigger return spring with a lighter one.
Then I reassembled every thing and it took me maybe 10 minutes total.
I now have a trigger pull of one pound with almost no creep or over travel.
It took me far longer to adjust the QB 78 trigger than this. And it is no better than the Disco now.
And the disco is a fine shooting piece which simply out classes the QB 78.
Also the disco seals have not failed as the QB 78's are prone to do.
However I know nothing about the 78 PCP as it is not available yet.