Have owned 4 .22 semi-autos. 2 High Standard Sport Kings, one Buckmark, and one Ruger Mark II Slab side. The Sport Kings were superb. Solid feel, accurate, and never jammed with any ammo. My impression of the Buckmark I owned was similar to the gentleman above. I was greatly impressed with reliability and accuracy, much less impressed with quality of trigger. Unfortunately, it was stolen before I could make any durability assessments. My current target gun in the Ruger. I really like the availability of aftermarket options and have been pleased with Volquartsen trigger/sear/hammer kit, grips and extractor. After a fair amount of tinkering the gun has gone 300+ rounds without any malfunctions using CCI Blazer and Federal Gold Medal. Prior to this I had trouble after about 100 rounds, unless I completely cleaned the gun. Can't suggest too strongly getting the American Gunsmithing Institute Video on the Ruger. A wealth of info for about $30-35.