Just got my new 452 American last night. I noticed that as you push the bolt forward, there is an angled face on the bolt handle that contacts the angled cutout on the receiver. The contact between the two is removing some of the blueing on the angled cutout of the receiver. Since I am new to CZ, I am wondering if this is normal? My Anschutz seems to use a similar method to transition from forward to down, but there is no blueing wear.

I dunno if this helps, as I have the Silhouette, not the american, but mine does not rub on the receiver at all.