Germany's 20 mm Guns

Weapon	Type of Ammo	Weight (lb)	Velocity	°	Thickness of armor penetrated (range meters)
					100	500	1000	1500	2000	2500
2cm MG151/20
20 mm KwK 30 & 38	Pzgr	0.148 kg	780 m/s	30	20	14
	Pzgr 40	0.1 kg	1,050 m/s	30	40	20
20 mm KwK 30 & 20 mm FlaK 38 L/55, 20 mm FlaK 30 & 20 mm FlaK 38 L/112.5	Pzgr	0.4 lb, 0.3 lb 0.148 kg	2,559'/s 780 m/s	30	20	14	9
	Pzgr 40	0.27 lb 0.1 kg	3,445'/s 1,050 m/s	30	40, 49	20
	AP			30	31	22
	APCR			30	49	35
2-cm FlaK 38, 2-cm Flakvierling 38		0.2625 lb 0.119 kg	2,953'/s 900 m/s

Vehicles that used 20 mm guns

• leichte Flakpanzer 38(t)
• PzKpfw II: Ausf a, Ausf b, Ausf c, Ausf A, Ausf B, Ausf C, Ausf D, Ausf E, Ausf F, Ausf H, Ausf J, Ausf M, Ausf L Luchs
• SdKfz 222
• SdKfz 231 (6-rad), SdKfz 232 Fu
• SdKfz 231 (8-rad)
• SdKfz 234/1 (8 rad)
• VK1601 Reconnaissance
• Wirbelwind

Sources:

1. Panzer Truppen The Complete Guide to the Creation and Combat Employment of Germany's Tank Force 1933-1942, Thomas L. Jentz, 1996
2. Panzer Truppen The Complete Guide to the Creation and Combat Employment of Germany's Tank Force 1943-1945, Thomas L. Jentz, 1996
3. Encyclopedia of German Tanks of World War Two, Peter Chamberlain and Hilary Doyle, 1999
4. World War II Infantry Anti-Tank Tactics, Gordon L Rottman, 2005
5. Panzers At War, Michael and Gladys Green, 2005
6. Artillery of World War II, Chris Chant, 2001