Can we get a list of what all these fictional things are most like in real life? It's kind of hard to tell without historical comparison points.
Sure, with the caveat that I am changing things and remixing them.
[ ] Sturgeon - Lever action rifle, full power round, tube magazine gate loaded. - Marlin 1895ish is the most direct inspiration.
[ ] Albee - slide action hunting rifle, good sights, slamfire, overloaded pistol round, tube magazine gate loaded - This is sort of the Colt Lightning, with some features from era shotguns as well.
[ ] Walt - Bolt action, five round integral magazine, generally competently made short rifle. - This is, approximately a p14 enfield/M1917 thing.
[ ] Blackfeather II - Improvement on the original Blackfeather, modern round, seven round magazine, gate loaded, very familiar. - Not an actual rifle but sort of a vibe of winchester rifles of the period.
[ ] Chatam - Straight pull bolt action, five round magazine. - This is the Ross, Vetterli, and a whole list of Swiss straight pull bolt actions.
[ ] Kamprad Nielsen - Shortened version of the infantry rifle, broadly cross compatible with infantry rifle parts, solidly accurate. - Kamparad Nielsen is Krag-Jorgensen
[ ] Berthier - three round en bloc clip, problematic cartridge, short and light. - Didn't change anything here.
[ ] Thornton - bullpup, ten round magazine, iffy ergonomics, bolt action - Thornton is a pretty 1 to 1 recreation of the Thorneycroft rifles.
[ ] Marsden - Semiautomatic, ten round magazine, incompatible with bayonets, expensive to produce, unreliable in extreme conditions - Marsden is Madsen 1896.