44 magnum is supposed to be a S&W model 29 The marksman carbine/all american looks like some sort of M4 carbine The anti material rifle looks like it was based on the Hecate rifle to me
The Cowboy carbine, brush gun and trail carbines are all modeled on various models of Winchester or marlin lever action rifles 357 revolver is modeled on the colt peacemaker The Service Rifle looks like an early AR-15 (but with the purple stocks of a very early AR-10) the drum for it looks like a converted Soumi drum with a feed tower added The 9mm SMG is a M3 grease gun (converted to 9mm. The Burning Mans pistol is a Commander length pistol with sights removed (and a 'trough' sight to make it easier to conceal and draw) 9mm pistol and Maria are Browning Hi-Power pistols
