FX IMPACT X gauges

Palm Beach Air Guns and Trenier Outdoors has them as well.

Ken, I installed the Wika's on my Crown. I don't have the part number off hand and they are larger than a FX gauge. I tuned the brass housing down in a lathe and even then had to increase the size of the holes in the stock. Just a heads up that it wasn't just a drop in mod. I'll send you a PM with a photo.

Jimmy