Fantastic optic but.... - Trijicon ACOG 4x32mm Rifle Scopes w/TA51 Mount

Excellent optic! unfortunately eye relief is too short for using properly with my helmet and ear pro, and NVG with piggyback RMR, so will go with the 3.5x. I've used both, and the weight is almost the same in real terms...I like the size of the 4x better, as it is smaller, but the eye relief is a massive difference for only using 0.5x in magnification.