What he sent me was a .50 caliber Traditions VORTEK model, topped with one of the 3-9x40mm Nikon BDC (Bullet Drop Compensating) multi-reticle Omega muzzleloader scopes. The rifle was identical (an almost exact duplicate) to a VORTEK rifle I often use as a test rifle. The only real difference in these two rigs was that mine is topped with one of the Hi-Lux Optics 3-9x40mm TB-ML multi-reticle muzzleloader scopes - which I developed for that company
What really sets the newer versions of the ART system apart from the military ART models of the 1960's is the cam system which automatically allows for the trajectory of the round being shot. Let's face it, the original ART scopes were set up to allow tactical shooters to keep hits on a man-sized target out to around 600 yards ... shooting rifles chambered for the U.S. military rifle cartridges of the time - the 5.56x45mm NATO (.223 Remington) and the 7.62x51mm NATO (.308 Winchester).