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The Prometheus pistons are still king in my books.
I've worked with a plethora of pistons and modified a lot of them through cutting and filing and the Prometheus ones still have the toughest material in my eyes. If I were to compare it to something, I would say it is similar to Tokyo Marui nylon, but tougher. The break on it I could describe as "moist" yet resilient. It's not brittle like almost any other brand.
I've worked on Systema red (old & new), Systema black, Area1000, Prometheus, Deep Fire, Guarder, Angel, PGC, G&P, Classic Army, Tokyo Marui, and countless others that I can't remember off the top of my head.
Prometheus is expensive, but IMO, well worth it.
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