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Metal ICS M4A1
I recently bought an ICS M4A1 (the full metal one from kights so its not a cansoft) and I just wanted to know. Can I swap out the stock spring for an M120 spring without having to do any additional upgrades? I would like to bring the fps closer to 400 for outdoor but I'm not going to bother if I need to upgrade a shitload of other parts.
Anyone who know please share the knowledge!
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