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The Systema aluminum are fine, just don't dent them or over tighten them. They run for years if you grease them once in awhile. The main issue is that PTWs drop one BB when you may change. If you don't let the BB drop before slapping the next mag in that BB gets pushed into the cylinder and can dent it. Then the o-ring rubs on the dent. But it's fairly easy to avoid. The modern stainless Systema cylinders are the way to go. I haven't heard of one being bad for quite some time, though that doesn't mean it doesn't happen. You will be alright picking up a used Systema aluminum one and taking care of it though.
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I have developed a new sport called Airhard. Pretty much the same as Airsoft, except you have to maintain an erection...
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