I think the mag tube of the Winchester is likely inside the jacket (incidentally the 1866 did have a wood forend). The Ottoman Army actually used the Winchester 1866 Musket to good effect at the Battle of Plevna in 1877. They ultimately lost, but held for months against a Russian force 3 times their size.
The Bergmann actually isn't necessarily missing the mag, it loads by inserting a stripper clip of ammo into a trapdoor in the side, as I recall the bottom is supposed to be open.
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