The breacher and Krebs sights are just bolt on, no perm mods have been done here. But I guess I'm missing something... what if there had been? I mean geez, in the end its just a Saiga, I got 2 more 12C guns I haven't even broke out of the boxes yet. Let's not forget that these things are cheaply made, highly functional shotguns, that is their only value. They are not some cherished family heirloom, and will never appreicate as such...