RITON Optics – Affordable, Quality Glass – RITON USA, the company, sent me one of their RT-S MOD 3 4.5-18X40 rifle scopes to go over and see what is what. Since that particular optic has a bullet drop compensator for 5.56 I decided to mount it on an AR-15 that I have reviewed in the past, the Double D Armory SST, so I know how the rifle performs. To eliminate other variables I used match ammunition from Gorilla Ammunition, and I also know how it performs.