I found my 527 .223 Varmint last year in a gun store in rural Louisiana heavily discounted. It was new, but from the literature in the box and date code, they'd had it at least 5 years or even longer. What sold me was the single set trigger and it was my first CZ long gun. When I got it home and ran a patch down the barrel I discovered it's a 1:9 twist, something I was told on another forum doesn't exist in the varmint. Lucky me.
As for extra magazines, why bother? They only hold five. I picked up a spare just in case of a failure at the range, but I really don't anticipate one, but an extra mag is comforting to have in the range bag just in case. I know of nowhere these mags are cheap. Slings are a matter of preference. Get what you like. I'm partial to Montana slings for my sporting rifles, M1907 slings for my precision and match rifles and the USGI M16 2 point slings for my ARs. If/when I put a sling on the 527 it will most likely be a Montana Sling. You can google them. I always recommend buying the most scope you can afford, but I don't always follow my own advise. For this rifle I had a Vortex left over from another project and since I shoot mostly 100 and 200 yards, the 6x24 comes in handy. If I were going to go out and buy one for this rifle it mostly likely would have been a 3x9 Leupold or Burris -- frankly, either of those brands have better glass than the Vortex.
Bolt clearance for the scope was an issue, and it's mounted a little higher from the bore axis than I normally like. I understand CZ has a lower radius bolt handle available, but I'm not dissatisfied with the Nightforce rings I used (also left over from another project).
Enjoy your new 527. Mine's become one of my favorite small caliber bolt guns.
