I have a DPMS LR-260 that I have dialed in very good. I currently have a VXIII 3.5-10X50 installed on it during the work up period. I have been looking at the Vortex Viper PST for this rifle. I don't really have a place to shoot beyond 600yds and will mostly be punching paper or hitting steel with it. I'm wondering for what I am doing, is it worth it to go to FFP or save a little bit of cash and go with SFP (been saving up for an AICS AE). Also been thinking about a USO in a fixed 10X. Opinions are welcomed. Thanks guys.