Gas gun setup never made it to the top of the build list. Still chasing bolt gun projects so this is on the block. Built to ride on a 16 - 308 inch gas gun (SCAR 17 / SASS / etc) that eats 175g, has a holdover style reticle designed for that purpose. I can email you the Manual for the reticle if you PM your email. Scope is Like New in Box. I just chase bolt gun projects now and this never even made it on a rifle. http://www.rapidreticle.com/USO762C.php $1750 to your door, lower 48 https://www.youtube.com/watch?v=YG-AyUkW8E8 https://www.youtube.com/watch?v=E-wdSWI9zaQ