From left to right:

.30 Newport
7.5x30mm
1907
Rifles, Revolvers
Notable weapons:
Newport Arms Company M1908 6 shot Revolver
Newport Arms Company M1908 Newport Lever-Action Rifle

8mm Immanuel
8x47mm
1898
Rifles, Machine Guns
Notable weapons:
Winfield M98 Immanuel Bolt-Action Rifle
Winfield MG13 Machine Gun

9mm Lewis
9x19mm
1921
Pistols
Notable weapons:
Winfield Model 21 Handgun
Glock 17LS

.30 Jayhawk
7.5x23mm
1925
Rifles, Pistols
Notable weapons:
NAC Model 25 Jayhawk Revolver
Springfield Model 36 Pump-Action Rifle

.50 HMG
12.7x74mm
1917
Machine Guns
Notable weapons:
Winfield MG17

23mm Lampero
22.7x155mm
1938
Autocannons, AT Rifle
Notable weapons:
NAC Model 38
Winfield Holepunch Bolt-Action AT Rifle
Winfield AC48 Revolver Autocannon

7-5 Newport
7.5x57mm
1914
Rifles, Machine Guns
Notable weapons:
NAC M1914 Lever-Action Carbine
Winfield MG14

.17 Moncarleo
4.3x21mm
1937
Rifles, Pistols
Notable weapons:
Aucxbau-Lemue AL37 Bolt-Action Rifle
Ruger 17MC Handgun

37mm Jackson
37x202mm
1933
Autocannons, Tank Guns
Notable weapons:
Winfield AC33
Winfield AC39
FHI M37J Tank Cannon