I haven't gone through and read every single post on this thread so I am not up to speed on the conversation. Just putting in my 2 cents. But here is what I know of polymer lowers. My buddy has a Plum Crazy polymer lower with a Stag upper. I was skeptical about it at first. Shot it, liked it. The control's are are very smooth. I like that I can put the gun to "Safe" after the hammer has dropped. He has put about 1100 rounds through the gun , not a single problem. He sure spent a whole lot less for his polymer lower than I did on my mil spec lower and his gun is a lot lighter than mine. Would I put one on a patrol or combat rifle? No. Would I put one on a range/plink/hunting rifle? Yes.
Has anyone done any testing with these to determine how much flex they have? As an Appleseed instructor I have noticed that the S&W MP22 which has a plastic receiver has some flex in it when using a tight loop/hasty sling. This flex does change the point of impact somewhat. Granted, most people aren't going to use these for competition shooting, particularly in high power matches but it is something to consider. BTW, I am not against polymer receivers, I have a couple Cav Arms lowers.
I don't see my anyone wouldn't wanna use the polymer lower for duty use. Polymer is tough as nails, and if it flexes, so what! It'll flex back into shape. Aluminum can't do that. If it gets hit hard enough to malform, it's stuck that way. Glocks and all the tupperware pistols get to go on patrol, so why couldn't this lower?
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