Just mounted 1 of these on my Insight Shooting Systems Inc. AR .223AI, and just love it. This scope is made for the 22 LR, but it's very solidly built, with sort of a mini-"Horus Vision" type tree-style 1st focal plane reticle. Seems to be decent enuf for brightness, with little distortion to the edges, and very little parallax out to at least 425 yds. Shot a 3-shot gp. at an Exbal-calc'd. 1.7 stadia units (this is a 22 LR BDC reticle, but easily adapted to anything really)below x-hair, and whacked the 425 yd. plate dead center for elevation. 3-shot gp. was 0 for vertical and about 3.5" horizontal. This is a sweet low-profile scope that's 1 of my favorites...so far.