I don't thing accuracy is inversly related to reliability. Every time when this subject comes people compare AK vs AR.
For a general isue rifle is little difference in accuracy between a modern DI and a modern piston gun.
When I say modern piston gun I mean modern rifles designed from the start as piston guns, not DI guns with a simple piston "fix".
There are plenty modern piston guns out there this days, that come from the factory just as accurate or better than the millitary m16 or m4. Maybe a 20K$ DI gun can be more accurate than a 20K$ piston gun, but those are the EXCEPTIONS, not the rule and very few people can shoot acurately enough to get that little extra.