Hey folks, I’ve heard of a few people swapping in a 1.6 Swift spring into the DZMK4 for a quick boost. If I do that, do I have to do any barrel mods? Or is the spring swap good enough to bump the FPS a bit?
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A spring swap alone should increase FPS. Walcom managed to get over 300 fps with an unspecified spring and a stock barrel with the extension modified to accept a SCAR - so, technically not a completely stock barrel, but something close to it for the purpose of velocity.
This was a no-parts-needed modification, so you might still want to do this minor barrel mod even though it’s not necessary for a quick velocity boost.