If you get the one from SVI, it is the same width of the sight tracker barrel. It took me about 30 min but I went slow. I have installed 4-5 Dawson sights. Just go to the Dawson website and watch his install video. You need an non marring punch, small hammer, small triangle file, vise, vise blocks and I use tape to cover things I don't want scratched. Go slow taking off material because you cant put it back on. Oh and some red loctite.