I have four Whitt Tool & Machine clamp on muzzle thread adapters for sale. I purchased these during a 25% off sale so it was buy three get one free. Nice product but could only get two of them aligned with my bore correctly to use my suppressor, and even then I had to clock them as they weren't in alignment at the 12 o'clock position.
Here is what they measure @ muzzle-1.625" X caliber, and what rifle they I mounted them on.
.561-.579 X .308 M70 SS FWT Classic .30-06
.562-.589 X .308 Howa Alpine .308
.620-642 X .308 M670 .30-06
.620-.637 X .277 M70 EW .270
These normally cost $75 each, Witt will cut these again to fit your barrel but I don't know what they would charge. I also purchased cheap 5/8-24 thread protectors off of Amazon for each adapter. These will work for someone else who wants to run a brake or Witt SME device but I wouldn't use with a suppressor in mind.
$30 each shipped
$105 for all four
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