The BRNO guns ARE bushed, however that does not automatically mean that the fit is correct. If you've been following my latest thread here, re the 6.5x57R and .32-20 WCF that I'm currently building, you'll note that I had to reduce the diameter of the firing pins, and insert smaller bushings into the discs. First firings with the original configuration showed way too much primer flow for safety. This is a Zabala gun but you might find these conditions in ANY make of shotgun. Keep in mind that your working pressure in a shotgun is around 10,000 psi, versus at least 30,000 psi, and possibly twice that, in a rifle. As info, if you mike the firing pins from a few of your bolt-action rifles, you'll find that their diameters run right around .060" and are close fits in their holes.. The average shotgun firing pin runs .080"-.090" and their fit tends to be quite sloppy, a significant difference.