The M19 is usually seen in 2.5, 4 and 6 inch, The snub has a round butt. The M13 is usualy found in 3 inch RB and 4 inch SQ. They are the M66 and M65 in stainless. The 19 has adjustable sights and shrouded ejector rod.
A 4 inch SQ M13:
A 2.5 inch RB M19:
A 4 inch SQ M13:
A 2.5 inch RB M19:
