I considered the mojo but with my 52yo eyes I wasn't sure it would work for me. I hadn't seen the tech,so I bought the lyman peep . They make a base with the correct contour for the sks.It is a side mount. I did the drilling and tapping myself, wasn't easy because the rieciever is quite hard . I also had to notch the stock for clearance. This is the standard Lyman micrometer peep so once you get it mounted it is a fine tool .