A lot (maybe most) of the guys working at gun or hunting related stores don't have a clue about what they're selling. Not long ago I was at a local outdoor store and overheard the guy behind the counter explaining to a customer why brand X scope was better than brand Y scope. "This scope here's the one to go with, it's got real strong parallax", he says. I started to ask him to explain parallax to me (which I already understand) for the amusement I would have gotten out of his explanation, but I just grinned and walked away. I think the customer was on to him too, he walked out without buying either scope.