That’s a valid point. These will need to be converted to 5 round capacity in a permanent manner as defined by the current regulations. Here they are -
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(5) For the purposes of subsection (4), altering or re-manufacturing a cartridge magazine includes
(a) the indentation of its casing by forging, casting, swaging or impressing;
(b) in the case of a cartridge magazine with a steel or aluminum casing, the insertion and attachment of a plug, sleeve, rod, pin, flange or similar device, made of steel or aluminum, as the case may be, or of a similar material, to the inner surface of its casing by welding, brazing or any other similar method; or
(c) in the case of a cartridge magazine with a casing made of a material other than steel or aluminum, the attachment of a plug, sleeve, rod, pin, flange or similar device, made of steel or of a material similar to that of the magazine casing, to the inner surface of its casing by welding, brazing or any other similar method or by applying a permanent adhesive substance, such as a cement or an epoxy or other glue.
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The online images don’t show me whether there is enough room around the spring to fasten a sleeve inside the lower section of the magazine so the follower can’t go down past it, or if you would need to cut the spring. There may be other options, and it would be nice to find someone who has done this before.