I just ordered a new barrel and handguard for my AR and instead of just putting the old parts in storage and forgetting about it I was thinking of building a new complete upper as I only need a stripper receiver to do so. I want this to be as cheap as possible and I found these ATI polymer uppers on Gunbroker that are only $25. I’ve only seen a couple reviews from YouTube but does anyone have one of these or knows anything about them?

Here’s the link to the Upper: https://www.gunbroker.com/item/868619786