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New Frontier are the only poly lowers worth a shit IMO
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Came to post this. Only polymer lower I've used and I had no issues. It had 5.56 upper for a while, but now it is under a .22lr upper.
These days just buy an aluminum lower. I paid $120 for my NFA polymer lower in 2013. The 5 other lowers I have built all used forged lowers that were half the price.
Also avoid polymer lower parts kits like the plague. NFA has a complete lower that uses a poly LPK. Don't buy that. Get the stripped lower and put a metal LPK in it.
Also, some fitting is required.
I had to take the dremel to the safety switch hole, bolt catch hole, magazine release "oval area" on the left of the receiver, and the takedown pin holes. So basically every hole.