My suggestion: Rather than dismantle a "hec of a nice rifle" to have it threaded, just buy another upper better suited to suppressor use. A mid-gassed 16" or rifle gassed 18" will make a better suppressor host than a "long bull barrel" anyway.
As for the "half way decent suppressor", just make a budget and buy within that limit. I bought a PSD .223 can as a budget purchase and would buy another(or two) simply on performance even though I have more to spend.
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