Well I now have 3 range sessions with my Sig 516/Vortex 1-4 PST . It has run flawlessly though 900 rounds, mostly IMI 855 or Federal 855. I am now shooting both the Hornady Steel cased match 55grn and 75 and it is grouping at .75 MOA or better. I will probably sell my the Stag Model 3 I purchased the week before the Sig. I would have never thought it would be that superior to the Stag. I wish I could replace my DPMS LR-308 with the Sig 716. The fit and finish is first class and cleaning is a joke. Clean the barrel/chamber, wipe down the gas piston and done. I will take and post pictures after this weekend.