First Focal Plane
Just what is First Focal Plane? In simple terms, the reticle size changes as you turn the magnification up or down, keeping it a constant in relation to the size of the target., When you increase the magnification, the target appears larger and so do the lines of your reticle.
Milliradian (Mil-rad) Reticle Scopes
We often get asked if our Mil-rad calculations are "correct" to the USMC standards. Yes, they are.
Any March Scope with a Mil-rad reticle that you purchase from March Optics USA, Inc. is guaranteed to precisely match the USMC spec Mil-rad which is 1/6283