Which buffer tube is it running? There's a letter stamped on the front easy to see.
Is it running a brake/comp or a2 flash hider?
I'm going to guess he's using a very light buffer, if it's a carbine buffer try an H, load a single round in a the mag a handful of times making sure the system still locks the bolt back when empty
I've never seen a 16 mid run harder than a car, should be smoother setup right
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