Constant-Force Springs are special-purpose extension springs designed to provide consistent amount resistance across no matter how far its ends are pulled away from each other. Originally sourced by FoamBlast as an upgrade for Nerf N-Strike Elite drum magazines, these "drum springs" feature a universal U-bend clip design that requires no extra hardware to install.
Below are all our currently available constant-force springs used for a wide variety of magazine types and capacities. Available in a variety of sizes to purchase for maintenance or repair of select blasters, or for custom mod projects. Organized by load (in Neutons) and ribbon width.
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FEATURES:
• Contant-Force "Drum" Springs
• Reliable, consistent pulling resistance
• Used for magazine followers and drum rotation
• Originially designed + sourced by FoamBlast
• Repair or upgrade Nerf Drum mags!
• Designed for 18-Round*, 25-Round, and 35-Round mags
• Compatible with select 3D-printed designs
*18-round drum mag requires glue to hold the spring
INCLUDES:
• 1 Drum Mag Spring of your choice
COMPATIBILITY:
SPR-035: OG FoamBlast 2N Drum Spring
• Nerf drum mags
• Misplaced Moose printed box mags
• Kptn A Super Drum
• Breacher Tube Mag
• Vulture Tube Mag (best feeding)
SPR-119: Half-strength 1N Spring
• Vulture Tube Mag (better dart compatibility)
SPECS
• Material: Spring-tempered steel
• Type: Constant Force Spring
• Dimensions:
Loads: 1-2N (± 10%)
Spring Gauge: 0.1
Extended Length: 558mm
Outer Diameter: 12.0mm
Inner Diameter: 7.5mm
Widths: 2.5-5.0mm
Coils: ~18
• Mounting:
U-Bend Tab
Tab Length: 20+12mm
LINKS:
• Mag Follower Springs
• More Springs
• More Hardware
