The Liberator came with ten rounds in a compartment in the butt. If killing Nazis made it pretty, it is still ugly as there is no verifiable record that anyone was ever actually killed with one. The ones sent to Europe seem never to have left England until they were dumped in the ocean, and none of the ones in the PTO ever endangered a Japanese soldier. A few were used by Filipino police after the war until they got better arms, and some were seen in China, but it seems unlikely they were ever used in any kind of combat.
In other words, like the Pedersen device, the idea sounded good when briefing the generals, but the enthusiasm turned out to be greater than the reality and the result was just one more waste of money.
Jim