I know you don't want to hear this answer, but it depends on how you mount it. Usually a 48-50" will be OK on a 175 if you mount it on the edge of the bow. Does this MG have the composite shaft or stainless? Are you going to use a removeable mount or make it permanent? A 50 should work, but the best thing is to get it and see how it fits - so check out the return policy.
Quote from: "GoneFission"What do you mean by mounting at the edge of the bow? I haven't done this before so I don't follow...Thanks
What do you mean by mounting at the edge of the bow? I haven't done this before so I don't follow...Thanks