This is exactly what happens. I've seen it many times when customers would bring me guns that "stopped working". Loose gas block (no dimple, no Loctite) stopped operating as a semi and went single shot.
Not true...I purposely did this (gas block was 90 degrees off) and it just created a single shot AR...used a Vltor clamp LPGB, DD clamp LBGB and a Sadlak set screw LPGB. All survived 20 rounds of true M855 (not "XM855").
OP: Although it says "steel" on the website, check it with a magnet to make sure it's steel. I've seen some gas blocks that have the same profile as steel but are actually made of aluminum...imported from China. If it is steel, it could be just junk steel (and probably from China) or already had some sort of a defect (bad machining, material defect). I've received emails from Chinese manufacturers peddling this kind of garbage (they make nearly every AR part you can think of so if you see prices that are "too good to be true", they're probably these low quality parts from China....so beware of low end vendors like Karri's)



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