The Johnson rifle was a revolver-fed semi-automatic rifle chambered in 30.06. It was designed in WW2 but not fielded (barring early pacific engagements) due to components being easy to lose and the tendency to misfire/jam because of the rotary cylinder.
http://en.wikipedia.org/wiki/M1941_Johnson_rifleI would love to see this baby in game, its a rifle fitted with a 10-shot revolving cylinder that shoots the same round as a Garand.
I envision it being a halfway point between DMRs and Snipers, with perks and traits along these lines:
Traits: Dijibooti Shooty & Unreliable
Perks: Knockback, Bonus Damage, Knockout Strike , Bonus Rate of Fire, and Better Knockouts; in that order.
Damage (Single): 50-65
60% chance to cause bleed
Bleed Damage: 40
Range:65
AP cost for:
Single - 45
Reload - 30
If needed I can mess around in GIMP and see if I can fudge up an placeholder image.