Sorry CC but so much wrong here
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A long gun has to have a barrel over 26" overall length to be classed nonrestricted (there are a few exceptions)
Not true, use Mares Legs as a prime example. They are not exeptions, they are the facts/rules. If a gun does not fit into the restricted or prohibited rules it is non-restricted. If you put a 10" "factory" barrel on a "factory" stock and action, even if it is under 26" OAL it is non-restricted as it does not fit any of the descriptions of restricted or prohibited. If you put it on a Choate folder or collapsible stock and it was under 26" OAL it would be prohibited unless the receiver was registered restricted and then it would be restricted. That is because it got that way buy folding or collapsing, no-no's under the rules for restricted/prohibited.
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A barrel manufactured 18.5" or longer cannot be shortened shorter than 18.5"
Actually it's 18" unless the barrel is for a semi-auto centre-fire but most gunsmiths won't go below 18.5".
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A barrel manufactured shorter than 18.5" can be installed on a long gun as long as the overall length is greater than 26"
See explanation one. It is not semi auto, It did not get shorter than 26" by cutting, modifying ( bolting together "factory" parts is not considered "modifying"), collapsing or folding so is non restricted.
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A barrel manufactured shorter than 18.5" is classed as restricted it can be shortened as short as you want but it can only be installed on a long gun if the overall length of the long gun is over 26"
As fraserdw points out, though somewhat incorrectly, barrels are not restricted due to length, barrels have no classification. If I have a 6" AR barrel it is just a metal tube, it is not registered or restricted or for that matter prohibited. If I put it on a non restricted action it would be prohibited and if installed on a registered restricted action it would be restricted. If I cut down an under 18" factory barrel and put it on a non restricted Contender receiver and that gun was under 26" it would be prohibited. If it was installed on a restricted receiver it would just be restricted. If I had a "factory" barrel made in the same length and put it on a non restricted receiver and it was under 26" OAL it would be non-restricted as it didn't get to that OAL by any of the no-no's in the regs. My 10" factory 44Mag barrel made my Contender 23.8" OAL and it was non-restricted. If a gun doesn't fit any of the restricted or prohibited rules it is deemed non-restricted unless otherwise covered in the CCC regulations, period.
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http://www.rcmp-grc.gc.ca/cfp-pcaf/faq/index-eng.htm#a3
Restricted firearms include:
handguns that are not prohibited;
semi-automatic, centre-fire rifles and shotguns with a barrel shorter than 470 mm;
rifles and shotguns that can be fired when their overall length has been reduced by folding, telescoping or other means to less than 660 mm; and
firearms restricted by Criminal Code Regulations.
Prohibited firearms include:
handguns with a barrel length of 105 mm or less and handguns that discharge .25 or .32 calibre ammunition, except for a few specific ones used in International Shooting Union competitions;
rifles and shotguns that have been altered by sawing or other means so that their barrel length is less than 457 mm or their overall length is less than 660 mm;
full automatics;
converted automatics, namely full automatics that have been altered so that they fire only one projectile when the trigger is squeezed; and
firearms prohibited by Criminal Code Regulations