How do I figure out if it's mod 15, or 15-2?
The fastest & easiest way to tell is the shape of the rear of the barrel where it comes up against the front of the frame.
The pic in the previous post is a 15-2, just like this one of mine.
If the barrel cover (called a shroud) is "
L"-shaped at this point, coming down to cover the front of the frame then its a model 15.
Those barrels were called "Porkchops" for the resemblance to the cut of meat.
There are other little differences, such as the shape of the barrel nut & so on but the obvious change is the "
L" shaped barrel.
Don't worry about the format of the barrel other than the "L", they came in several lengths & styles. There were lengths from 3" to 12", light, heavy, heavy vented & so on types.
It would need the barrel nut tool (several kinds exist, make sure you get the right one), the gap setting gauge (or a 6 thou standard automotive feeler gauge) if you decide to change or check the cylinder to bore gap. A firm called "
EWK" has all sorts of things for the DW series, give 'em a call or check the website.