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Speaking of the MG13, here's a Yugoslavian Zastava M76 rifle, and a WW2 Walther G43 rifle, both with modified MG13 magazines inserted. With 25rd capacity, that gives you quite a lot more firepower than the 10rd magazines typical to either of these rifles, and even the 20rd magazines of the M76. Not necessary for the kind of rifles these are, probably, but I like it.
Modifying old surplus MG13 magazines to work in various 7.92x57mm rifles is something I've seen people do a lot over the years. Guns which I've seen this done with:
>Egyptian Hakim rifles (probably the most common)
>Walther G43 rifles (less common, as these rifles are less common)
>Mauser G41 rifles (even less common)
>K98ks and M48s, etc, various Mauser 98 pattern rifles in 7.92x57mm, I guess you could quickly fill one of these magazines up by using five 5rd stripper clips in sequence
>Zastava M76s, and other Zastava 7.92x57mm AK rifles
>FAL custom built in 7.92x57mm
>FN49 in 7.92x57mm
There's probably more guns which people have done this with, potentially it's doable with the Zb.26 machinegun, and probably various guns in 7x57mm Mauser, as the cartridge dimensions are mostly the same. Possibly doable with an FG42 rifle, which may be a great advantage for one of those lucky persons who has one, as FG42 magazines are supremely rare and expensive items. Could probably also be done with the Walther G41 rifle, if you really insist on shooting it.