Caliburn MuzzleVF1 Friction Fit

This is a quick modification to Slug's Caliburn MuzzleVF1 file, which is an extended muzzle break essentially. It is a friction fit onto the aluminum barrel and doesn't require screws to be attached. I found that the muzzle would be off-axis from the barrel because of the single screw point and I wanted it to work for when I eventually swap out for a longer barrel.