How to plug a Canuck hunter

[u/Tristan1477]

I just bought this Canuck hunter 20 gauge used and it didn’t come plugged. I cannot figure out how to get the mag tube open to insert a plug. Tried prying the circle cap you see out figured as is was like other spring retainers but didn’t budge, any help is greatly appreciated.

[u/bwilly590A1]

I'm not a hunter, but I am a Canuck that prefers not to be plugged. Don't let that stop you from doing your whole pluggin' thing, though.