I bought a 9mm Obsidian for QRF......They walked me through the Silencer Co kiosk, and now I have an additional 2 stamps pending.
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I would go Obsidian 45 for sure. Tons of flexibility to put it on almost anything pistol caliber, reasonably priced and a wide variety of mounts for almost everything is readily available. We just got more in stock.
http://www.quietriotfirearms.com/product_p/ruggedobsidian.htm