I borrowed a friends Winchester Model 101 28 ga S/N 2399XX to shoot some clays. I ran two boxes of 2 3/4 inch 3/4 oz #9 and had no problem with the functioning of the gun. When I went to clean it I discovered a hair line crack on the right side of the fore - end stock. The crack extends about 6 inches down the fore-end. Questions: Is this a common problem? Can it be repaired and by whom? If a new one is necessary where can I purchase one? See attached pix. Thanks in advance for the help.