Mossberg 940 JM Pro

Threading a cap on is exactly what Mossberg did to make a Canada models and would do the same on the 940. Have you physically seen an extended mag model in the store or are you going based on what you see online? Most online retailers selling a JM pro series will show a stock image with the mag extension, but it will be detailed in the notes that the gun is actually a 1+5 not a 1+9. Here is an example

https://selectshootingsupplies.com/930-jm-pro-series-autoloaders/

If you placed an order, you likely would not have received it. Mossberg putting a wooden plug in the gun that could be removed by simply unthreading a mag cap is not the permanent alteration required by Canadian regs regarding centerfire semi’s.

I know personally of someone that bought one plugged. I’ve held it in my own hands. But I guess I wasn’t there to watch him purchase

Regardless, Mossberg will simply offer a “Canada” version.
 
Could you stick a Briley extension tube on it for more capacity if the Canadian model comes with limited rounds.

Briley makes the chokes tubes for this gun.
 
Could you stick a Briley extension tube on it for more capacity if the Canadian model comes with limited rounds.

You could if you have no regard for the stupid laws we have. Gun clubs do not allow prohibited firearms, which is what it would be with a mag capacity of more than 5. You also run the risk of getting booked with a prohibited device which it would be even if it has a plug. Mags for semi centerfires that hold more than 5 rounds need to be permanently altered and a plug isn't permanent. Doesn't make much sense, but it is what it is.
 
You could if you have no regard for the stupid laws we have. Gun clubs do not allow prohibited firearms, which is what it would be with a mag capacity of more than 5. You also run the risk of getting booked with a prohibited device which it would be even if it has a plug. Mags for semi centerfires that hold more than 5 rounds need to be permanently altered and a plug isn't permanent. Doesn't make much sense, but it is what it is.

So a little dab of epoxy would make it permanent, problem solved.
 
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