The latest Colt Python is identical to its 3", 4.25" and 6" stablemates other than its 5" barrel. The difference and the magic is in that "in between" barrel length.

The blue Python will initially be offered with 4.25" and 6" barrel lengths. When I started in law enforcement in the late 1980s, the 4" Python was considered the “Cadillac” of duty guns.