Doesn't the barrel of a SP89 right at the front sight base, just like on a MP5K? I have glanced at a SP89 before but never looked inside the end of finger guard over the muzzle. If the barrel ends flush at the front sight base, there is no barrel to thread?
I spoke to Curtis and he explained that he could weld onto the end of the sp89 barrel and attach the 3-lug adapter. You are right in that the sp89 barrel ends flush at front sight. I don't think anyone else is converting the sp89 barrels to 3-lug.
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