Custom machining the end of a barrel
- Thread starter suprathepeg
- Start date
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- Edmonton, AB
Don't bother. Your head will explode if you try to make sense of it.
The barrel length regulations for longarms refer to barrel length, not rifling length.
Barrel add-ons - brakes, compensators, etc. - don't qualify as part of barrel length for legal purposes. eg - lengthened M=1 carbine barrels.
The non-restricted version of the 180B has a muzzle unit machined as part of the barrel, so it counts as part of the barrel for purposes of measuring length.
If a centrefire rifle barrel is being altered, there are two legal limits, one for manually operated rifles, the other for semi-autos. Rimfire minimum altered barrel length is a bit different, there is no distinction between manual and semi-auto.
MagnaPorting is a commercial process which creates ports in a barrel using EDM. This doesn't change the length of the barrel for legal purposes.
Barrel add-ons - brakes, compensators, etc. - don't qualify as part of barrel length for legal purposes. eg - lengthened M=1 carbine barrels.
The non-restricted version of the 180B has a muzzle unit machined as part of the barrel, so it counts as part of the barrel for purposes of measuring length.
If a centrefire rifle barrel is being altered, there are two legal limits, one for manually operated rifles, the other for semi-autos. Rimfire minimum altered barrel length is a bit different, there is no distinction between manual and semi-auto.
MagnaPorting is a commercial process which creates ports in a barrel using EDM. This doesn't change the length of the barrel for legal purposes.
MagnaPorting was a proprietary process for cutting ports in rifle and shotgun barrels. Don't know if it is still available. If you drill, ream, or mill into a finished barrel, burrs are thrown up in the bore. With Electron Discharge Machining, the part is submerged in an electrolyte, and a shaped electrode is brought up to it. Because the stock removal process does not involve mechanical cutting, there are no burrs thrown up in the bore. The port can pass right through the rifling without any negative effect on accuracy. MagnaPort used trapezoidal shaped ports in rifle barrels.
MagnaPorting is still available but only in the US. They moved operations from Winnipeg in the early '90's. If the barrel length is less than 16", you can't ship to the US. Longer is OK, with the appropiate paper trail.
Well, since the law specifies that the barrel must be of continuous rifling, you can add rifling + chamber as well.
KPA
You contradict yourself. According the the law, barrel length is the length of the barrel that is rifled, add ons, brakes, etc. don't count. The AR180B-2 is the exception to the rule, because it is all one piece.
If the compensator or porting is done as part of the original barrel then rifling does NOT become a requirement.
Rifling only applies as a requirement if you are dealing with an extension or add-on to the original barrel... in that case the law says that the extension must also be rifled otherwise it's not considered part of the measureable barrel lenght.
The chamber is NOT rifled but it does count as part of the barrel length. As do some handguns that have integral compensators that are made out of barrel and are not ADD-ONS. We had a Wilson that was approved by CFC... barrel rifling ends at just over 4" but there was almost 1/2 inch of barrel that is bored out and has a compensator machined from the barrel... it is NOT an add on. CFC considered that part of the actual barrel and counted as barrel length. Had that compenastor been threaded on or attached separately then it would not have counted as it is not rifled.
Strange but that's the way they do it.
From our experience, if it's part of the original barrel then it counts, whether rifled or not.
Mark
Rifling only applies as a requirement if you are dealing with an extension or add-on to the original barrel... in that case the law says that the extension must also be rifled otherwise it's not considered part of the measureable barrel lenght.
The chamber is NOT rifled but it does count as part of the barrel length. As do some handguns that have integral compensators that are made out of barrel and are not ADD-ONS. We had a Wilson that was approved by CFC... barrel rifling ends at just over 4" but there was almost 1/2 inch of barrel that is bored out and has a compensator machined from the barrel... it is NOT an add on. CFC considered that part of the actual barrel and counted as barrel length. Had that compenastor been threaded on or attached separately then it would not have counted as it is not rifled.
Strange but that's the way they do it.
From our experience, if it's part of the original barrel then it counts, whether rifled or not.
Mark
Add-ons don't qualify - not integral part of the barrel. If the brake, whatever, is an integral part of the barrel, as in a 180B, it is part of the length of the barrel.
The law does not refer to rifling in the barrel. The interpretation for attempts to alter a barrel to a longer length do refer to the rifling. For example, welding an extension to a barrel does not qualify. Welding on an extension, then reaming out the bore, and installing a liner does.
