Well my rifle is a model 12 fv .223 1-9" twist barrel with a mueller apt on top. I am very pleased with the performance of the rifle so far. Two weeks ago I shot some black hills 75gr bthp and the best groups of the day were .485 at 100 yards and 1.08 at 200. Yesterday I shot at 300 yards and the best group was 1.764 and the next was 3.03, I had one that got away from me. This was done with 26 grains of varget and a 69 grain smk. I was also able to hit some clay pidgins and ring some steel. I am extremely impressed by this rifles performance so far and cant wait to go back and shoot at 300 and stat shooting at 400 and 500 yards. I am hooked!