Originally Posted by Ruger22lr
Polymer lower that means the lower receiver is polymer right? Also isn't polymer plastic? If so I think it is not sure.
Yes lower in AR talk = lower receiver. Upper= upper receiver. Striped lower = just a plain lower no trigger group, take down pins, buffer tube ext. striped upper = just the upper no BCG, charging handle, gas system, barrel ext. and yes polymer= high impact plastic.