Plum Crazy polymer lower assemblies?

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I have one on my 16" tactical for deer hunting. Works well and keeps the rifle light. I also have another on a CMMG upper. Ive put several hundred rounds through mine with no issues.

Thanks! That's interesting to learn. I was looking at one at the gun shop today, and the store owner told me that after a while the polymer parts start breaking. I'm not sure whether or not I'd shoot it enough to reach that point.