Can anything be done to fix extreme zero shift due to mounting a suppressor?
I have a Gemtech GM9 that, when mounted via 3-lug to a Sig MPX, will, at 50 yards, group over a foot to the left compared to when the suppressor is not mounted. (Curiously, at 25 yards, the leftward shift is only about 2-3 inches or so.)
By comparison, when the same suppressor is mounted via 3-lug to a Colt 9mm carbine, there is almost no discernible shift at 50 yards.
Any ideas on the cause, and how I might fix such an extreme shift on the MPX?
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