Why Upgrading Your Benelli M4 Magazine Spring Matters
The Benelli M4 is widely regarded as one of the most reliable combat shotguns ever produced. However, one often-overlooked component that can significantly affect performance is the magazine spring—especially when upgrading to a 7-round magazine tube.
The Problem with the Factory Benelli M4 Magazine Spring
The OEM Benelli M4 magazine spring works well when brand new, but it has a known drawback: it takes a set quickly. As spring tension weakens over time, shells may not be pushed far enough out of the magazine tube and into the loading gate.
This can lead to:
- Failure to feed
- Shells contacting the receiver before fully presenting
- Loading gate jams
- Increased issues with lighter loads and 3″ shells
These problems are especially concerning if your Benelli M4 is used for home defense or duty applications, where reliability is critical.
How the Wolff Benelli M4 Magazine Spring Solves This
The Wolff Benelli M4 High-Power Magazine Spring is designed to address these issues directly. The spring is designed to start slightly overpowered, ensuring that once the spring naturally takes a set, it maintains ideal tension for long-term reliability.
This results in:
- More consistent shell presentation
- Improved feeding under varied ammunition types
- Reduced chance of loading gate malfunctions
More Room in Your Magazine Tube
Another advantage of the Wolff spring is its shorter solid length when fully compressed. With fewer coils and slightly larger spacing between them, the spring compresses to only about 2.01″, compared to roughly 2.11″ for the OEM spring.
That extra 1/10″ of space may not sound like a lot, but it can be the difference between fitting 7 instead of only 6 rounds in the magazine tube—particularly with longer crimped defensive shells that often exceed target load lengths.
For shooters looking to maximize internal space even further, combining the Wolff spring with a Benelli M4 Max Room Follower can add approximately another 1/8″ of usable room for a total of approximately 0.22".
Built for Longevity and Performance
Wolff magazine springs are manufactured from high-carbon spring steel and feature closed and squared ends, ensuring even seating on the follower and reducing the risk of binding. With more than 70 years of experience dedicated exclusively to firearm springs, Wolff has built a reputation for unmatched consistency and durability.
Every Wolff Benelli M4 Magazine Spring is made in the USA, using proprietary materials and processes that set them apart from generic aftermarket alternatives.
Should You Upgrade?
If your Benelli M4 still uses the factory spring and functions flawlessly, testing it at the range is always recommended. However, if you:
- Run a 7-round magazine tube
- Use defensive or duty ammunition
- Rely on your Benelli M4 for high-stakes use
Upgrading to the Wolff Benelli M4 Magazine Spring is a smart and inexpensive way to increase long-term reliability and peace of mind.
