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With Prometheus barrels I find Prometheus rubbers to work best, maybe because Prometheus barrels have a larger outer diametre than others. Also, many barrel spacers will not fit over a Prometheus barrel. I know Systema and VFC spacers work.
As for barrel length just stick to 509 with M16s, any longer and it will stick out. The only gun I know of where 550 is the perfect length is the CA/G&G M14.
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