Have a lone wolf on the gun now. Tried a caspian 35 slide and had the breech face crack around the striker hole where a circle around it popped out. Got it replaced. The new one was way too tight where it shouldnt be and told its gun smith fit. I understand fitting it to the frame etc but this was the FP would rub in the breech face as it came out, the vanek FP safety(wich is a touch smaller than factory from where he rounds it would barely fit and then there was no way it would move freely. The factory one wouldnt even come close. Both went back and I got the lone wolf. No problems at all and I like the look of the lone wolf better as well. On the lone wolf, if you dont want that ugly logo on the back of the slide, order it blind marked where all markings are hidden under the slide. The barrel can be ordered the same way