This! I hate it when I find an OEM barrel that is threaded 'Merican style. I was lucky enough to pick up an OEM threaded G19 barrel a few years ago. Wish I had gotten the G17 and G21 barrels while I was at it.
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I've had good luck finding difficult to source OEM stuff on Gunbroker. Just recently I hauled in a factory new G21 threaded barrel and a SiCo Octane three lug adaptor.
Interesting discussion on the metric vs. standard threads. While Scottryan is correct that with a sprocketed piston, the booster itself wont unscrew as sprocketed pistons transfer all of the torque to the fixed booster housing, at least in the Octane and Surefire Ryder 9Ti. I had the whole booster housing/cage (the "permanent" part) on the Octane unscrew from the can using the metric arrangement. Used some Permatex and haven't had an issue since.
Factory metric threads for me and never a problem. Plus, it's much less expensive to buy the pistols already equipped this way.
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I recommend SilencerCo
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IMG_7518 by 556 Channel (HD), on Flickr
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IMG_7504 by 556 Channel (HD), on Flickr