I personally use sure-loc, and would suggest the leathal weapon or the special op's both sights are very close to being the same and can be interchanged on the same riser mount. ( you can use one for 3-D and the other for hunting.) I use the leathal weapon for target shooting w/razor pins and the special op's for hunting because these pins really show up in that last half hour of hunting. Both of these sights are easily adjustable and very durable with the leathal weapon having more micro adjust to it. I have not used the copper john so I can't give you an honest opinion. Hope this helped. Hope to see you on the range this summer.