I believe that some "solid" ribs which are hollow, as has been stated, have the "Hollow" stopping short of the muzzle. It would thus actually be "Solid" at the muzzle. The front sight may not be set back quite far enough to be a 100% indicator. It could show solid there & than as you cut back a ¼" or so behind it you might cut through.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra