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Form-1 can over bore allowance?
I googled a little bit and didn't find the answer.
I'm planning a form-1 can and was wondering how much overbore is allowed?
What I'm saying is, typically, for a .30 caliber suppressor it is common to use a 3/8" drill bit.
So, when you put caliber on the form-1, you list 30 caliber, even though the hole is physically .375"
All manufacturers use over bore to avoid problems with concentricity and instability.
But the ones I have all list the intended caliber on the markings.
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