All the Brno ZKK series are heavy for their respective classes and do not balance or handle well. The triggers, whether single or single-set, are not great and can be difficult to adjust. The safety operates backward. The pop-up peep is admirable machining but really not that useful. Particularly in the later versions, most of the somewhat excessive machining is a bit crude. The forend "Rosewood" tip on the bulky "Monte Carlo" stock is really just dyed forend wood....the white line is a U-shaped insert, not a real divider. The "classic" stock is way too low for scope use. Wood finish is crude and benefits from a refinish, just like most Zastavas. Open sights are crude. Scope mounting can be a pain. Good barrels.
In general, they fall into the category of "improved Mauser" and like others in this category, are not much of an improvement at all.
Not sure 7lbs is a heavy long action rifle. Pretty average, an Win M70 from the same era weighs in at 8lbs.
Haven't seen one with a bad trigger yet, can be set very easy for single stage, the set stage is trickier to adjust for sure.
The straight comb stocks are comfortable to me, and I don't have any issues lining up irons or scope when shouldered, seems set up pretty good, I have to lean into the stock for the irons a bit, but scope is right there.
The irons are quite good, the peep is set up for 100m, and the folding notch would be set up for 200-300m...that was the idea anyway.
The safety is not hard to get use to, but it isn't silent, it does click when engaged/disengaged, bit of a let down there.
The forward pushed set trigger is light, but not necessary as the single stage is just fine. Plus it kind of throws you off with the reach and over travel, doesn't really seem to improve accuracy. Same gripe I have with the CZ triggers on the 527.
Definitely a lot of complex machining, and the sear design is complicated as well. Very robust however and I can't see anyone wearing one out.
Much more complicated design then an M70 from the late 60's/early 70's.