How, exactly, does the CFC determine a semi-auto pistol's barrel length?

[Kindly Old Coach]

From what point to what point must one measure? Is there an official diagram?

 

[tiriaq]

Breech face to muzzle face, use a rod. A depth micrometer would be excellent if available.

 

[Kindly Old Coach]

Thanks. I can probably lay my mitts on a depth micrometer tomorrow; guess hood-to-muzzle would work for a quickie estimate.

 

[Kindly Old Coach]

Damn. 4.128", or 104.85mm by the tail of my reloading caliper.

 

[tiriaq]

Hood to muzzle, or breechface to muzzle? Not necessarily the same thing. A reloading caliper may not be 100% accurate. You are only looking for a few thou.

 

[Kindly Old Coach]

I ran the tail of my caliper down the barrel of the assembled EMPTY pistol, bottomed it out against the slide breechface, and rested the frame-end across the muzzle.

Caliper's a decent one. Same reading, couple of times.

 

[tiriaq]

So close..... I do not know what tolerances the CFC techs accept. I suspect they would want a clear 105mm, plus.

 

[9mikemike]

They look for a good 105+, just don't tell them. That is awfully damn close. Take some epoxy and put a light coat on the muzzle that should bring her up

 

[Deckard]

If it fits too easily up their asses, then it is too small and therefore prohibited.

 

[sunray]

They go by what the manufacturer says it is. The actual measurement doesn't matter. A cleaning rod into a closed action then measured will do, but if the maker says it's a 4" barrel, it won't matter to the CFC. There are no CFC techs in any case. Just clerks.

 

[tiriaq]

The techs work in Ottawa, not Miramichi. Access them through the CFC/Miramichi.

 

[Splatter]

Do you need to submit this for verification? Or are you just wondering about someting that someone has?
I like the epoxy idea. Make sure the muzzle is good and clean so you get a nice bond.

 

[Kindly Old Coach]

Was just wondering if a prohib I own actually *is*.