I have a 527 Carbine in .223 now, and have had two others in 7.62x39. Great little rifles, light and handy, extremely accurate. I haven't had a problem with any of them suffering from sticky or binding bolts. Unfortunately, all three of these latest generation Carbines have triggers that simply don't compare to the older ZKW465's, which I owned in .223 and .22Hornet. I don't adjust them to be extremely light because I tend to use them in extreme cold weather for coyote hunting, so the trigger is usually adjusted at no less than a pound in the set position, which translates to several pounds unset. I'm not impressed with the grittiness and lack of smoothness in the trigger pull when adjusted this way. They're still very shootable, but not nearly as smooth and crisp as I expect from a set trigger. Those who praise this trigger should try the double-set trigger on an old Brno, Steyr or a single-set Merkel...that's the way they are supposed to feel! Crisp as a snapping icicle, imperceptible overtravel, and absolutely consistent from one pull to the next.