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Me and a friend where playing split screen co-op and at a later round he died. When he respawned, he upgraded his pistol and got two pistols. Upgraded version and a normal version.
Basically, if you just have a pistol and you upgrade it, you will get an upgraded colt and a normal one.
BUT WAIT----
Im thinking this could be exploited. Say your in a situation. You have 2 guns, (eg. MP40, Thompson) You upgrade the thompson but was downed while you tried upgrading it. You where revived but you where unable to get the Thompson in time so all you have is an MP40.
What you could possibly do is Upgrade the MP40 that you have then you would recieve an Upgraded MP40 and a normal one.
Its just a glitch me and my friend found so dont flame if you dont find it useful. This is the glitch section after all haha

^