FIRST FOCAL PLANE (FFP) RETICLES

The main feature of the First Focal Plane Reticle design, also known as FFP, is that the reticle size "increases" or "decreases" as you turn the magnification up or down. This occurs in such a way that the reticle always covers the same percentage of the target, either in MOA or MILS. When you increase the magnification, the target appears larger and so do the lines of the reticle. This also applies to the distance between any vertical or horizontal hash marks.

 Another important feature of this reticle design is that the point of aim (POA) does not change over the entire zoom range.

Generally FFP reticles are thicker than Second Focal Plane reticles when at maximum magnification. They need to be so that you can still see the reticle line at minimum magnification; as the reticle line gets thinner as you reduce the magnification. Any elevation and windage hash marks also get physically closer together as you view them in the scope however on the target the distance between the  hash marks consistently covers the same MOA or Mils on the target.   

Therefore, the advantage of a FFP scope is that if your hash marks  are one MOA or one MIL apart on the target at any magnification. Whereas a SFP scope the hash marks are only one MOA or one MIL apart  on the target at one designated magnification.  

The special reticle design in the March scope allows target acquisition quickly at both low and high magnification.