I do a video of my ar 15 build with a Polymer upper and lower receiver.
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g36 is entirely made out of polymer and it doesnt fail so no its not going to fail unless you are doing some crazy shit to it
How well did it hold up?
I wouldnt have a polymer lower upper or any of the above !it screams junk an malfunction I wouldnt bet my life on any plastic gun
Out of curiosity do you know the weight of this weapon?
looks very good.
The problem you're having with seating the barrel into the upper is coming from your lack of experience with building AR's. If you had more experience you wouldn't struggle as much as you are.