Need for a Special Gun Case (MN)

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I recently added to a Benelli M1 Super 90 pistol grip 12 ga. shotgun an E.R.Shaw cantilevered slug barrel and scope for deer hunting.My problem now is that I don't have a soft case that will fit this gun.The pistol grip along with the scope and mount make it taller than usual.Where can I find a case that's wider than the typical 11 inch wide case for scoped rifles to accomodate my needs. My gun is 46 inches long over all too.Any ideas would be appreciated. Thanks Old Iron Mike from SE Minnesota...