I rebarreled my Brno 21 with a Walther Model A contour in 9.3x62 and fitted it with a Recknagel 3 leaf express sight, which fitted perfectly. I didnt specify anything other than the caliber and twist. I wanted a mannlicher carbine so it is chopped at 20.5". Everything is polished waiting to be picked up and rust blued. The rifle balances beautifully for me, right on or just before the front screw. I think the contour is right on the money. Some might find it a tad heavy maybe, if wanting a light weight rig.