Tried shooting rimfire silhouette matches by switching from the Model 41 with optics to the K-22 with irons, and the transition just wasn't as easy as I thought. I hadn't planned on them being that different. So, another 5.5" heavy seems to do the job well. Swapped them back and forth for a couple of days at the range and they both hold zero perfectly. And I can shoot the M41 with irons better than I can shoot the K-22 with irons when I'm swapping from M41 to K-22. Sure is fun and very inexpensive compared to all my centerfire pistols.