I thought I'd start a little game of naming weapons that were used by both sides. Note: this excludes captured weapons, unless put into production by the other side. Lets says either produced or purchased by both sides. To increase the scope lets say all wars not just WWII.

I can think of two.

1. The Browning HP pistol was used by the Waffen SS after the capitualtion of Belgium AND it was used by the Canadians as the Browning corporation had just opened a factory in Canada where the pistol was produced under license.

2. The Oerlikon 40mm Anti-Aircraft gun. This gun was sold by Switzerland to both Germany, Japan and the USA. The funnying thing was both the IJN and USN used this gun as their principal AAA defense on capital ships.

Ok that should get the ball rolling, can anybody think of anything else?

The Germans prized the British 3inch AA gun and even mad their own ammunition for it

To increase the scope lets say all wars not just WWII.

This will make the list almost endless, so are you sure you want to expand to this scope? I will not even get into swords, knifes and the likes of that.

1) 1852 .58 Lee Enfield was used by the confederates and union soldiers.
2) Stinger AA missiles, during Desert Storm.

Fn rifles by both British and Argentine forces during the Falklands

Majority of Civil wars could be characterised by both sides using the same weapons. The American War of the States was a little bit different.

Mmarsh, you have said that the captured weapons should be excluded.
Why then:

1. The Browning HP pistol was used by the Waffen SS after the capitualtion of Belgium AND it was used by the Canadians as the Browning corporation had just opened a factory in Canada where the pistol was produced under license.

The Chinese and the Vietnamese forces in 1979 have used the same Soviet weaponry - AK's, RPG's, etc.

Almost every country has some form of or captured Mauser K98 rifles, including the USSR. The Walther PP and PPK have been used by every police force and armed forces since it was first made.

We used captured AK 47 during the Suez invasion in 1956

DC-3 Dakota carrier aircraft
US name C-47
Japan name "Type-100"
Soviet name PS-84&Li-2

The Russian built there Version of the B29 after a number of B29 landed in Russian Territory during WW2

The AK-47 has been used on both sides of every war in Africa since the 1950's. The only exceptions were the wars involving South Africa and then Rhodesia, both of whom used their variants of the FN-FAL. All of the wars north of that area involved AKs, AKMs, RPKs, RPGs, and every other former Soviet Bloc weapon they could find.

Dean.

EDIT The AK-47 variants were also used against each other during the Sino Vietnam war.