Originally Posted by ghost tracker

Okay...I'm caught. I have never owned an AR featuring a Calvary Arms poly lower. But I shoot with a bunch (two or three dozen) of pretty serious AR builders. I've built some (uh...five) myself. One of our gang made a well-intended, vallant effort to (ignore the rest of us and) base his first AR on a CA poly lower. The results were less than satisfactory. He eventually went with a more conventional alloy lower (there are several perfectly good ones) and found the performance of the otherwise identical components much more to his liking.

If your experience with CA has been excellent, I'm pleased for you. My admittedly limited exposure leads me away from selecting them as a starting point. I would simply prefer a factory built Mini.