Joined: 04 Mar 2008
Location: Williamsburg, VA
I do not know what could cause a Model 90ST to double fire. However, the Model 90ST has an inertia weight that is supposed to keep the gun from double firing. Maybe the internal mechanism just needs to be cleaned.
Hopefully it's just crud in the mechanism/ sears. Worst case scenario is that one or both sears have worn to the point of losing the proper engagement angle. Do you always fire the same barrel first? If so, see if it doubles when firing the other first.
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