oldarmsofidaho.com
stingerworx.com
By the few accounts of using these that I have seen, they do not work well.
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StingerWorx Silencer Mount for L2A3 Sterling SMG | 1.375"x24 Threads for HUB Mount Suppressors
Introducing the sweetest fruit of collaboration between StingerWorx Suppressors and Old Arms of Idaho - The L2A3 Sterling SMG Silencer Adapter.oldarmsofidaho.com
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StingerWorx Suppressors
Selling modular firearm suppressors and gun muzzle devices built for hunters, precision shooters, and firearm professionals. Made in the USA.stingerworx.com
Out of stock but the video is only 2 years old so it is a recent product. If they aren't still in production there's enough pictures there a decent hobby Machinist could probably crank one out

I'm disappointed to hear that. It worked like a charm on the several guns we've tried them on. Perhaps I should try to use some Cerakote layers built up to try and fine tune alignment. I'll try that and get back to the group.By the few accounts of using these that I have seen, they do not work well.