Quote:
Originally Posted by Legbreaker
Pulling apart and reconfiguring would have to completely screw up the zero of the weapon....
Even if it had been zeroed before in that config, just the slightly different seating of the parts is likely to throw the zero off a couple of mils.
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Actually if the sight is already mounted and zeroed on the upper you will not have this problem. In this case one would leave the sights on the respective uppers.
At least that is the way I did it. Till I got around to getting lowers for almost all of my uppers.