The Lewis gun normally fired from a magazine. I don't know the round capacity (100 rnds. I think), but one of the mag's functions served to help the cooling. Every mag change helped the barrel to cool effectively enough to keep firing 'thru numerous mag changes. And - especially in the air, cooling wouldn't be much of a problem ... those old guns could probably run (shoot) all day and still put out a 300-350 RPM rate.
Like Stu, I'd LOVE to have a 30-06 version ... 'tho I'd
happily buy .303 dies if all I could get was the original chambering! I always wanted a full-auto ANYTHING, but the practicalities of procuring ammo on my budget makes that a dream only. The best thing that happened to me was the Army ... it got me over the "full-auto itch!" Now, basically all I see is dollar signs streaking downrange when I see some lucky stiff firing ANY "fast" gun, from a Gatling gun, Ma Deuce, or up to the M134D (the Dillon 7.62 modified GE minigun gatling-type gun so often seen on the boob tube. Having fired over a million rounds - all paid for by my taxes (and yours too, thanks very much!) consisting of 45 ACP, 9mm Para, 7.62 NATO, & .50 BMG, I don't "itch" (much) many more.
What I'd
really like to have is an M3A1 "Grease Gun." They are a hoot and I could even (somewhat) afford to shoot one a couple times a year! I wouldn't mind shooting an Uzi again, either.