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The quick change spring in my KWA saved me from a ruined day one time. Brought my gun to the field and their chrono read it hot for some reason. Luckily I brought a lower powered spring with me and my castle nut wrench. Took me less than 3 minutes to take off my buffer tube and swap the springs.
Can't really live without it, especially if you only own one rifle and plan to play at different fields with varying FPS limits.
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