It appears to me that there is a burr and a pronounced area of rubbing, (see arrows), on what would be the upper edge of your follower. It is likely that this surface is dragging against an internal surface of the receiver.

(Also, per 'Madsenshooters' measurements, your follower-arm shaft/cam is .046" longer than the later model 1898 type. This possibly is causing the whole assembly to sit high and bind).

BTW - Your magazine cut-off is in the 'block cartridge feed' position.

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