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The tech sights look like they would have to be removed every cleaning. That would get old real fast shooting corrosive ammo. Remove the sight then you wold probably need to rezero after every cleanning and then clean some more rezero. The other is not available for SKS yet.
I have the tech sight and I love it. I also have the williams firesight for a front post. I like having the sight close to my eye, but that might just be me. It seems like with the longer dist. between the front and rear sights, the accuracy would increase. As for rezeroing after removal, the set screws in the back of the sight do not move, so when you go to reattach the sight, they should be pretty close to the same zero. Not perfect, but pretty close. Does anyone have the Mojo sight?