The magazines are removable but only with the use of a tool.
Let me break it down for you:
SB23 (CA version of the now defunct AWB) says:
A center fire semi-auto rifle with the ability to accept a detachable magazine cannot have 'evil' features like a pistol grip, forward grip, collapsible stock, or grenade launcher. SB23 also requires that a fixed magazine rifle not be able to hold more than 10 rounds.
A letter was sent to the CADOJ asking to define what a 'removable magazine' was.
They replied, "A magazine or ammo feeding device which can be removed from the firearm without the use of a tool, and time".
They further went on to define a bullet or round as a tool.
The bullet button was born.
So. That rifle has a shroud around the original magazine release that you cannot get your finger in but can get a bullet tip or other small item into to manipulate the magazine release.
I have also put a pop-rivet in my 30 round rebuild kits to stop the follower at holding no more than 10 rounds.
Hence this rifle can only accept (technically, and by the DOJ's definition) a 'NON-Removable' magazine since it requires a tool to remove.
I wear my 'tool' around my wrist on my right arm on a short lanyard. If I drop my right arm the tool falls right into my grasp. I work the mag release, and change mags. Now back to shooting!
In action on one of my ARs.
I can have all the 'evil' features, and still be within the 'letter' of the law.
Hey, They wrote the rules. We just found a way to abide by the 'rules' and still have our Yugo M70 underfolders.