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my rifle is both polymer upper and a polymer lower. i believe it is also mixed with carbon fiber i may be wrong it is a Windham M4. I haven't beat it to death yet but it has held up quite well and eats what ever ammo i put in it. It has no problem with steel cased cheap ammo either. The rifle is so much lighter compared to the all metal AR's. Im waiting on the first polymer AK that wont tear its self apart.

I like that rear sight what kind is it and what is your fore grip? i don't reconise it. but your rifle looks nice

See. You really can learn something from an old geezer.

I bought a complete NFA (New Frontier Armory) lower a few months prior to Sandy Hook. During the bad times, but not yet the worst of it. Mated it to a CMMG 1:9 upper. I haven't shot many rounds through it, but so far I'm very pleased with it. My only concern remains long term wear of polymer vs. steel. However, I'm buoyed by the fact that my 25+year old G17 still shoots just fine. If/when I find the need to replace FCG parts I'll likely go with traditional metal parts, but maybe not. I expect that decision is a long way off.

Thanks for that torture test video!

I had a complete poly lower from ATI that I ordered from PSA. I never got to attach an upper to it. The only issue I had with it was the hole for the buffer retainer was very tight when I was assembling it. The build quality of it felt good. I just wish I was able to test it out before I traded it. The only thing I didn't like about the video was them cutting out when removing the lowers. They should have made the video continuous when doing it.

I have several of the poly lowers. No issues.