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Either trade cylinders (or cylinder shells) with someone (some people do need the unported cylinder for running a 14.5" orga barrel) or just get a ported king arms or alpha arms cylinder.
$150 for a systema stainless shell is outrageous.
If you plan on using the alpha or king arms internals though, its a really good idea to take the cylinders apart, regrease, and reassemble with blue loctite.
The KA cylinders are notorious for falling apart while shooting if you dont loctite them.
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