I have a 1901 Model 3E, with Whitworth Steel barrels. I believe that the Model 5 came with upgraded barrels from their "Nitro" steel. You may wish to look on the flats for the Whitworth or Krupp trademark.
Mine has a rather flat stock, and and an original buttplate marked Trap. Original 2 3/4 inch chambers, 30 inch barrels, about 7 3/4 lbs, and I use it for ZZ and wobble trap in S/S competition. I use Winchester Nitro 27 #7 1/2 and Commercial live pigeon 1 1/4 loads for ZZ, and Winchester AA super handicap loads for wobble trap which were OKed by couple of knowledgeable gunsmiths (Kirk Merrington and Cyril Adams). After a few thousand of these loads, I have yet to see any cracks at or near the lockplates. I also have a 1926 LC Smith hammer gun, 30 inch barrels, original 2 3/4 inch chambers that I use in vintager events using modern sporting clays ammo. Still no cracks in the stock. Jim Haynes
