It could have been marketed as a barrel tensioner.
Flash hiders/flash suppressors are illegal in California. This device was designed to skirt that rule.
https://oag.ca.gov/sites/all/files/a.../regs/fsor.pdf
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Years ago I bought a similar device for a Century 91 I had at the time. Made it look like a heavy barrel.
Born in the US of parts made in Emmingen, Baden-Württemberg.
Devastation to your doorstep in 30 minutes or less...Minuteman III LGM30G.
Awesome it worked out for you
That's great news!I had a smaller, similar device on my SAR-3/8 (Overstamp) and was able to remove it to reveal the original threads intact underneath.