I'm in the process (more like waiting for my Form 1 to be returned approved) of building my PS90 into an SBR. I've looked at the optic choices available for the rifle and have decided on a Trijicon ACOG. I've already ordered an ACOG mount from Mark at TROSUSA but here's my dilemma - hardly any of the local shops carry the ACOG sight so I'm disadvantaged in that I can't actually take a peek through several models. I'm looking (online) at the 1.5X16S, 1.5X24 and the 2X20 models - I'm leaning towards the 2X20 just for the extra magnification. I feel that green is the way to go but I am open to suggestions for other colors. I have shot rifles with conventional scopes using crosshairs for many, many years so I am most comfortable with that set-up. Anyone have experience with the "ring and dot" reticle or the triangle reticle? Any advantages or disadvantages to one or the other? Originally, I was set on the 3X30 with the green Chevron .223 ballistic reticle but Mark discouraged that choice due to the limited eye-relief of the model. Any thoughts or suggestions on power choice or reticle would be greatly appreciated!