QSC stands for Quick Spring Change, a technological feature in airsoft guns that allows for the rapid exchange of the spring without the need to disassemble the entire gearbox.

Some manufacturers enable this exchange through the stock, eliminating the necessity to remove the gearbox from the weapon body (e.g., Specna Arms with ESA2 or SAEC, Delta Armory, and CYMA Platinum with their QSB and others).

QSC simplifies the assembly of the gearbox after maintenance or upgrades, as the spring pressure does not cause the internal parts to pop out.

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