The proprietary PWS piston system requires custom tools for disassembly and reassembly, which is why we offer an armorer's course to select dealers and vendors. If you have a preferred vendor and they are not certified as a PWS armorer, we can coordinate disassembly before and reassembly after the cerakote has been done. If you do not have a preferred vendor, please contact PWS Customer Service to obtain a list of vendors we work with on a regular basis.