For a PCC, I don't see aluminum as being an issue. The Phoenix is an update of the old Gemtech MK-9K, which was also all aluminium, and examples have seen hundreds of thousands of rounds without issue. I believe that the OEM suppressor for the H&K MP5SD is also all aluminum (the MP5SD-N uses stainless steel baffles so that it can be fired while there is water in the can).
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