Ah. Ron is one of the venerable collectors on this forum, he specializes in Lugers made up to the end of WWI.
The "accellerator spring" he talks about is in the fore-stock of a Luger Carbine. It engages a tab on the bottom of the barrel. It assists the considerable mass of the Carbine barrel/receiver/toggle assembly move back into battery after the breech closes on a new cartridge.
It sounds like the leaf-spring assist you describe is something else entirely, and will probably be new to almost everybody here.
--Dwight
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