I noticed that when I used a metric thread file to fit rework the threads to fit the MetalTech RAS on the M16, I could still re-install the factory PTW barrel nut. I think what I ended up doing doing was taking the threads down enough so that either would fit, but not perhaps as good of a thread "mesh" as if I used an Imperial barrel nut on a receiver with Imperial threads. But either one holds up solid.
That sucks about the Madbull, but at least I've already altered the threads so I could fit it anyways.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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