Are you precision rifle guys happy with your FFP 4-16 Vortex? It appears to be the least expensive FFP in the plus 10 X range.
Least expensive would be the Primary Arms 4-14 FFP.
Havent shot the FFP model, but the PST 4-16 SFP with MRAD reticle has treated me nicely.
Lots and lots of threads using search tool on this site:
https://www.m4carbine.net/google.php?cx=010536845846440650985%3Aridd3_u3s3i&cof=FORID%3A10&ie=ISO-8859-1&q=vortex+4-16+FFP&sa.x=8&sa.y=17&sa=Search&siteurl=www.m4carbine.net%2Fforumdisplay.php%3F13-Optics-amp-Mounts&ref=www.m4carbine.net%2Fshowthread.php%3F172181-Vortex-4-16-FFP-Reviews&ss=5887j3161939j16