r/canadaguns • u/Mammoth_Attention_59 • Aug 03 '25

BCL MRX mags in Renegade

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As title suggests:

I bought some mags, but encountering the following:

  • bolt will not go forward
  • extremely tight in mag well

After comparing to pmags, it seems the spine of the MRX mag is higher.

Is it legal to mod these mags? Anyone have experience making this work?

I just wanna go pew pew with a 20 rounder lol

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u/gnu_gai Aug 03 '25

"Overcapacity" magazines are prohibited devices, and modifying a magazine is considered to be manufacturing; therefor modifying an MRX magazine to fit a rifle is manufacturing a prohibited device. On the other hand, manufacturing a non-restricted firearm for personal use doesn't require any special license; so you can modify an NR semi-auto rifle to feed from MRX magazines because the magazines are still considered to be intended for a manual action rifle.

Not a lawyer, especially not your lawyer, etc. etc. Call CFO to confirm if you like

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u/Mammoth_Attention_59 Aug 03 '25

But there is no laws that would restrict utilizing an “over capacity” mag if it fits, in a manual action rifle?

I’ve seen people use these mags in the renegade - just curious about experience!

But thank you for the comment, it overall is great info

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u/gnu_gai Aug 03 '25

You can use a factory magazine in whatever firearm it happens to fit in, the capacity limit is based on whatever the RCMP decide the magazine is designed for. For example using 10 round pistol magazines in semi-auto rifles, or the RCMP retroactively deciding that all 10/22 mags are designed for the Charger pistol and therefor limited to 10 rounds

But for illustration let's say it's a couple years ago and you have an non-restricted AR180. Modifying the rifle to fit the 20-rounds MRX magazine is fine, because you can manufacture NR rifles for personal use with just a PAL, and you don't need to register the changes. But modifying an MRX magazine to fit the rifle is considered manufacturing a prohibited 20-round magazine for the AR180

So in theory you could modify the MRX magazine to fit a different manual action rifle without issue, but if it also happens to fit a semi-auto you'd probably have a court case on your hands