Thread: A-Cat semi-auto mag capacity

Been following a thread on the Other Forum (I'm a slut like that) about magazine capacity...

from the Arms Act:
"military style semi-automatic firearm means a firearm that is
a semi-automatic firearm having one or more of the following features:
a magazine (other than .22) that
(a) is capable of holding more than 7 cartridges; or
(b) is detachable, and by it's appearance indicates that it is capable of holding more than 10 cartridges".

The poster comments: "...a detachable 10 shot mag is permitted as long as it doesn't look like it takes more than 10 shots. This is a change from the first definition of MSSA
where the detachable mag capacity was 7 shot".

So...I have an A-Cat licence. I have a couple of steel 10 shot mags for my AR that have been factory pinned to 5 shot.
Would like to grab my power drill and drill out the rivet to restore capacity to 10 shot.

Is this legal? Would appreciate your opinion.