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I have a Panzerfaust from war machine. The thing is a beast. Its robust and very strong. It hase a allen screw set up on the rear for pressure control. I found out that the sweet spot is 240 PSI. Another bonus is you can rapid fire this thing with no problem, with out losing pressure. I dont know anything about the RAP 4 model. I had a T-68 GEN 5 air marker. Absolutly hated it. I have since sold it.
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