The quality still wasn't what I wanted a few years ago when I built my two. I ended up buying sun devil manufacturing uppers and putting them together. After running my two I wish I would have just bought quality right uppers. I've only shot mine suppressed and I don't think going LH saves much gas blowback in your face also replacement parts are much more difficult to find. I don't know if they are in stock but cmt and sun devil were where I was looking when i bought mine.
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