Yes, either this or pinned to make them 2 rounders. Just wondering how hard it would be to take the mag. apart and put some kind of limiting device in it so that only 2 rounds fit in. Should be legal as with other semi-auto's, you can put anything in the tube mag. to make it so that you can only put in 2 rounds into the magazine and one in the chamber max.
I would hate to pin a good mag. In Ontario, it is enough to temporary block the mag to 2 round capacity in order to take it hunting. For this purpose, most shotguns include a special plug that you can put into your tube magazine for example. Anyway, worst case scenario, I can make a T shaped mag floor plug myself, but a commercial version with the proper length or a single dedicated 2 round mag would be better.