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I have a Rugged Obsidian 9 that goes on my FN509T and M&P 9L.
On the 509, I have to tighten every few rounds as it likes to walk off even with Teflon tape. Not as much as a problem on the M&P with Apex barrel; perhaps a thread tolerance issue on the 509? I dunno.
I think I shoot more rimfire with that can than 9mm.
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