Lancer Tactical
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Lancer Tactical's M140 is a heavy piano wire spring for Version 2 and Version 3 AEG gearboxes. Note that the product name and the package contents field on this listing name different spring ratings, so confirm with us which you are ordering if that is the deciding factor. It's rated well above what most stock setups use, so fitting one means the rest of the gun has to be built to match: a full steel tooth piston, gears with enough torque to pull it, a motor that won't stall, and battery and wiring that can carry the current. Dropping this into an otherwise stock gearbox is the most reliable way to break one. Check the rules where you play and chronograph the result on your BB weight before you rely on it.