MMMhh Pathfinder, I think that would be Swiss steel, and only on the slide yes? Aluminum frame, ok we can call it an alloy. The BAR definitely is a manly gun, but sadly unavailable to most of us, even the semi versions take mucho dinero.
The M1 is definitely a manly gun. Manly guns mean big projectiles, at a decent rate of speed or really heavy large projectiles at a nominal rate of speed.. Arthur has some interesting picks, but is very limited.
I guess lets start out with what does manly mean? I think things that less than a MAN would not want to participate in, however stupid that may be on reflection after the event. I once worked for a shooting range, sighting in rifles, mounting scopes and so forth, and I thought why would people pay me to sight in their guns? Well some people are not good at it, but some people are really smart and let me sight in their heavy rifles. After a day of .460 Weatherby, and 500/475 nitro shooting, off the bench, I decided that the range rates were way too cheap, and my clients were very smart. You learn really quickly to shoot a very good first shot and do your math. 10 - 15 rounds of 30/06 is no big deal, but shooting the behemoths, makes you pause. Get out the book, look up the trajectory, pay attention to the sight or scope adjustments and do it in a very efficient manner.
Lets make our own list of manly guns or cartridges.
1) .50 BMG of course.
2) .460 Weatherby
3) .600 nitro express, and the slightly smaller variants.
4) 8mm norma magnum
5) lets take a break, almost all the magnum rifle cartridges above 30 cal.
6) 45/70, .444 marlin, 50/110, all those lovely 350grn + bullets in .40 cal and bigger.
7) .54 cal muzzle loaders are very manly. Especially if you grow a beard and look like Charleton Heston in the " Mountain Men"
.500, .460 S&W magnums
9) .44, .41 magnum.
10) all the Linebaugh cartridges.
11) the Howdah pistol, oh yea.
I'm not going to hog this thread, post your own vision of manly guns and cartridges.