I have an early M158 barrel with ¼-28 threaded forend stud on an NC SB2 frame, it fit fine with minimal adjustments. The M58(058) was made 1975-86 as a combo 30-30 or 22 Hornet and 20ga according to the BBGV. I had a complete 1972 M158 30-30 at one time, the barrel on it wouldn't come close to fitting any of the 2 dozen SB2 frames I had at the time without some major work on the pivot, way more than I've ever had to do.
Tim