i have no letter on this gun it seems every gun i trade for the books are lost on them... i have measured them they are 3 1/2 and are at least as your gun as thick as .100 this gun could go to 8 ga if bored..i have already shot several modern 3 1/2 inch shells thru this gun and it is marked twist barrels that are 30 inches.iut has the little wiggly line across the end of the barrels i assume never cut.serial number is 69388 it is a ph modeltop lever opening gun.i wish they had a book for this gun..hope you find your answers... charlie
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