The insanely long cartridge in the middle of the gun belt is a round known as a 50/120-3 1/2. It is a round for a Sharps rifle. The Sharps rifle I have is the 45/70 which are the other rounds in the belt. The 50 is a 50 caliber (1/2 inch diameter) bullet, with 120 grains of black powderbehind it and is 3 1/2 inches long. It is said that when that cartridge came out, the buffalo simply surrendered.
I have that round in my belt as a half-way marker when reaching for ammo. Also it looks cool.
The Sharps copy is made by Pederasoli (Italy), One of the shotguns is by Rossi (Brazil), the other is Chinese. The revolvers are by Uberti (Italy). The Lever action rifles are by Marlin (USA).