The Regulation is pretty clear. A mag can be 5 rounds, if made for a rifle, and 10 rounds if made for a pistol. Bulletin 72 was the correct interpretation. They can change the bulletin to read "bananas in a rifle, peppers in a pistol", but it still won't change what's legal and what's not.
The bulletin did provide a childproof document to show an over-zealous LEO. We'll now have to show them a highlighted page from the Regs, but it's not a total game changer.
Unless the RCMP can change the Reg, we're still OK, yes?
http://laws-lois.justice.gc.ca/eng/regulations/SOR-98-462/page-2.html#docCont
3. (1) Any cartridge magazine
(a)
that is capable of containing more than five cartridges of the type for which the magazine was originally designed and that is designed or manufactured for use in
(i) a semi-automatic handgun that is not commonly available in Canada,
(ii)
a semi-automatic firearm other than a semi-automatic handgun,
(iii) an automatic firearm whether or not it has been altered to discharge only one projectile with one pressure of the trigger,
(iv) the firearms of the designs commonly known as the Ingram M10 and M11 pistols, and any variants or modified versions of them, including the Cobray M10 and M11 pistols, the RPB M10, M11 and SM11 pistols and the SWD M10, M11, SM10 and SM11 pistols,
(v) the firearm of the design commonly known as the Partisan Avenger Auto Pistol, and any variant or modified version of it, or
(vi) the firearm of the design commonly known as the UZI pistol, and any variant or modified version of it, including the Micro-UZI pistol; or
(b) that is capable of containing more than 10 cartridges of the type for which the magazine was originally designed and that is designed or manufactured for use in a semi-automatic handgun that is commonly available in Canada.
LAR-15 is a pistol, therefore 10 rounds. Unless someone can find a specific "thou shalt not put Mag A into firearm B" - it's the Mag that's pinned, not the rifle.