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Illusion built the mechbox in my M16A4. SystemA reinforced gearbox, super torque ups, polycarb piston, silent piston kit, bore up cylinder, the list goes on I can't recall.
The box has been working in my gun now for 3 years with nary a burp. Was opened once for lube and maintenance and it was still clean - a perfect storm of parts plus expert assembly.
Some guys like Illusion and Gump have a gift with mechboxes. I wouldn't hesitate to get a custom build from either of those two again in a heartbeat.
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