All barrels and shrouds within a model series are compatible, thus a Model 15-2 frame from the 1970s may be equipped with a barrel from the 1990s and a shroud made in 2016.
All barrels and shrouds within a model series are interchangeable, so a Model 15-2 frame from the 1970s can be fitted with a barrel from the 1990s and a shroud made in 2016.