Looking at the photos, and my guns, it appears that the split was not cut. Also several posters have noted that their guns have no such split. I'm guessing that the forend is designed to fit very tight, and some split after the being installed and others do not. I have two Wingmasters made during the 1980's with the same split. I can assure you it does not hurt anything at all. Mine are nearly 30 years old and have never given me a moments trouble.