I'm not a plastic magwell user either.
Too good too be true ! KMT Labor day sale was $211.99 for Slide and Barrel.That's because it is a Gen 4 slide.
I received two of the knock off magwells. The first one is going on the G40 build. It's already installed. The second one is going on my G20 that is 4 or 5 years old.Those Carver replica magwells are nice. I've purchased many of the Carvers and was really happy to see these as they are around 1/5 the cost.
I have a 24lb spring on my G20. It eats everything ! I just need the SS rod assembly and the adapter. I put a few more items in my cart as well.NDZ Glock 20 21 40 41 Gen 4 Guide Rod Assembly Their Labor Day sale is still in effect. Automatic 15% off. Get 20, 22, and 24lb you will thank me.