Wolff +5% Extra Power Magazine Spring for S&W 39/3900 Series
Part Number: 73061
Premium Wolff +5% extra power magazine spring designed for Smith & Wesson 39 and 3900 Series 9mm pistols. This enhanced spring provides improved feeding reliability and consistent performance for these classic 3rd Generation semi-automatic pistols.
Key Features:
- +5% Extra Power: Enhanced spring tension for reliable feeding and reduced malfunctions
- Wide Compatibility: Fits multiple models in the 39/3900 series
- Premium Quality: Made in USA by Wolff GunspringMakers with over 75 years of expertise
- Easy Installation: Direct drop-in replacement for factory magazine springs
- Corrosion Resistant: High-quality spring steel with protective finish
- Consistent Performance: Maintains proper tension through thousands of cycles
Compatible Models:
This magazine spring fits the following Smith & Wesson 9mm pistols:
- Model 39
- Model 439
- Model 539
- Model 639
- Model 3904
- Model 3906
- Model 3913 (current models only - see note below)
- Model 3914 (all variants)
- Model 3944
- Model 3954
- Model 909
⚠️ IMPORTANT COMPATIBILITY NOTE: NOT compatible with early Model 3913 pistols with plain end coils. This spring is designed for current Model 3913 variants with formed end coils.
Technical Specifications:
- Spring Type: Magazine Spring
- Power Rating: +5% Extra Power
- Caliber: 9mm
- Material: Premium spring steel
- Finish: Corrosion-resistant coating
- Manufacturer: Wolff GunspringMakers (USA)
- Condition: New
- Weight: 2 oz
- Package: 1 spring per pack
Installation Instructions:
- Safety First: Ensure firearm is unloaded and magazine is completely empty
- Disassemble Magazine: Remove base plate by depressing the locking tab and sliding it off
- Remove Components: Carefully remove the follower and existing spring
- Install New Spring: Insert the Wolff spring with smaller coils positioned at the bottom
- Reassemble: Replace follower and base plate, ensuring proper locking engagement
- Function Test: Load a few rounds to verify smooth feeding and proper operation
Pro Tip: Slightly compress the spring before inserting the follower for easier installation. The entire process takes less than 2 minutes per magazine.
Why Choose Wolff Springs?
Since 1948, Wolff has been America's premier manufacturer of precision firearm springs. Their extra power magazine springs are engineered to exacting tolerances, providing enhanced reliability for duty, carry, and range use. The S&W 39/3900 series pistols are legendary firearms, and Wolff springs help maintain their performance.
Frequently Asked Questions:
Q: How often should I replace my magazine springs?
A: For carry and duty magazines, replace springs annually or every 5,000-10,000 rounds. For range magazines, replace when you notice feeding issues or every 2-3 years.
Q: What's the difference between +5% and factory springs?
A: The +5% extra power spring provides slightly more tension, which improves feeding reliability, especially with hollow-point ammunition or in dirty/adverse conditions.
Q: Will this work with aftermarket magazines?
A: This spring is designed for OEM S&W magazines. Compatibility with aftermarket magazines cannot be guaranteed.
Warranty & Returns:
Wolff springs are backed by the manufacturer's quality guarantee against defects in materials and workmanship. All products are eligible for return within our standard return policy period if unused and in original condition.
Package Contents: 1 Wolff +5% Extra Power Magazine Spring