Dave,
This is what the magazines looked like before Schoenauer came along with his rotary clip patent.



What looks like two arms attached to the floorplate are actually a follower spring and the edge view of the follower...the motion is compounded by travel much like the Krag follower.



the gun is in 7x57 but I had to rebarrel it and it's not blued yet...also somewhere along the way, some one removed the butter knife bolt handle, ...I'll be putting it back

Great M/S you have there...it's really hard to come by an engraved one...I think there is info on those adjustable cheekpieces in the August Stukenback catalog...