I guess I can give you half an answer. I bought and installed them (rear sight only) on a Swiss and a Swede. They install easily, appear to adjust well, are well made, don't look bad on the rifles, and do give me a much better (excellent) sight picture. I am 60 and the rear military sights don't work for me anymore. Also, the customer service experience was excellent as I recall. But, I haven't shot with them yet. Seems I do more buyin' and talkin' than shootin' anymore. So, up to this point, I think they are great. I have a little time off in the next few days, I believe I'll go to the range.