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After a long wait, Monkee Mods finally bringing you a new spring for upgrading your QWK Challenger MK3 Pro.This is a 12KG spring for QWK Challenger MK3 Pro, a tougher spring that can provide you a higher FPS count with your QWK Challenger MK3 Pro.Expected FPS with this 12KG spring:210 - 220 FPS with..

This tougher spring that is bundled with Monkee Mods Firefly Blaster. Get it replaced when your spring is wearing out.Spring Rate: 12KGExpected FPS in Firefly: 200 FPS (Tested with Worker Gen 3 Dart)..