I picked up a Yugo M70 B1. The ones with the black furniture. It was used very little when I got it. Anyway the slant break had several scratches on it. Other than that the rifle was perfect. So I decided to swap it out with a new slant break. All information I have checked states that the break is 14x1 L. I picked up one at a gun show. It was supposed to be the correct one and it didn't fit. So I figured maybe it was wrong being I had picked it out of a box of hundred. So it wasn't a big deal. So I ordered one from Tapco. It doesn't fit either. So could the rifle be a different thread than 14x1L ? thanks for any help.