Thanks for that, I have often wondered. I also wonder why no-one bothered with the Weaver version when it was available?
P.S. Although I've never seen the 4.5-14 Weaver Tactical I was jammy enough to get my sticky mitts on a Weaver Tactical In the 3-9x40 flavour. I'm a little surprised Lightstream didn't do a version of the smaller scope if, as suggested, the 4.5-14 is indeed based on the Weavers.