I think "rough as a cobb" is a bit harsh and possibly just not describing the feel of the K31 bolt the way I feel it. Yes, if I run the bolt slowly on my K31 (or my brother's), I feel all of the bolt turning and cock on opening force when pulling the bolt backwards. To me, that's just a lack of leverage by not being a turn bolt. I feel the same force on Mauser type bolt guns when opening the bolt slowly. Where the K31 does smooth out is when running the bolt backward and forward quickly. Kinda the same with a turn bolt gun where if you open the bolt quickly, it feels smoother when unlocking and cocking. To me anyway. Firing from prone? My main problem with the K31 is the cocking ring tries to hit me in my glasses. So, I have to move my head while racking that bolt back. I don't have that problem with the same length of pull in a typical turn bolt gun.