I’m buying a rifle scope combo. The scope is a Nikon Buckmasters 6x18x40. It has the power adjustment in the rear the windsge and elevation on the top and side like normal. My question is about the adjustment ring at the front of the scope. I’m sure it’s for distance since it has 100 150 on out to 1000. Is that a parallax adjustment. The guy at the gun shop said that’s what it was but I’m used to seeing that adjustyon the opposite side from the wind age knob. Also it has the kinda goofy looking tall turrets. I thought they were 4” tall when I first looked at it but I was told they’re about 3/4 maybe an inch tall