Stoner’s AR design uses an internal piston. OpRod guns have an external gas piston.
Stoner’s design for the AR has only a tiny bit of unbalanced reciprocating mass outside of the centerline of the bore, essentially just the gas key. The AK family, OTOH, has considerable reciprocating mass outside of the centerline of the bore.
Another reason I always say “OpRod” and not “gas piston.”
It shouldn’t take 24 minutes to explain. At 5 minutes you had it explained. So I quit watching as now I know the difference.
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