Benelli M4 Recoil Tube Guide
Benelli M4 Recoil Tube Guide
The recoil spring tube — also called the receiver extension — is one of the most important and misunderstood components on the Benelli M4 platform. It determines whether your stock is fixed or collapsible, how many adjustment positions are available, and which stocks are compatible with the shotgun.
For Benelli M4 owners, understanding recoil tube variants is essential before buying a collapsible stock, upgrading an M1014, or purchasing aftermarket parts. The four main factory configurations are:
- 1-position recoil tube (classic)
- 2-position recoil tube (classic)
- 3-position recoil tube (classic)
- 5-position recoil tube (EXT)
Each has different compatibility, legality, and historical significance.
What Is the Benelli M4 Recoil Tube?
The recoil tube threads into the rear of the receiver and houses the recoil spring assembly. It also acts as the mounting interface for the stock.
On the Benelli M4 platform, the recoil tube contains machined locking notches that determine how many positions a collapsible stock can lock into.
The tube itself is steel and is installed at the factory with thread locker. Removing one is considerably more difficult than on an AR-15 buffer tube and usually requires heat and proper tooling.
The Single-Position Recoil Tube (Civilian M1014)
Overview
The single-position recoil tube is most commonly associated with the civilian M1014 Limited Edition models (AKA: American Flag Benelli M4).
These shotguns are shipped with the iconic skeletonized collapsible stock, but the stock does not actually collapsible because there is only one locking notch on the recoil tube.
This non-collapsing configuration existed primarily because of 922(r) U.S. import restrictions
Characteristics
Typical features include:
- One locking notch
- Skeletonized “C-stock”
- Fixed overall stock length
- Military appearance without collapsible functionality
- Usually found on M1014 commemorative/import models
The single-position tube became infamous because many buyers assumed their stock was fully collapsible until they tried to adjust it.
The 2-Position Recoil Tube (Discontinued)
Overview
The 2-position recoil tube is relatively uncommon and has largely disappeared from the market.
It offered:
- A fully extended position
- A fully collapsed position
This tube was the legacy design first used in the military.
Compared to the later 3-position tube, it offered less adjustability and never became especially popular.
Why It Was Discontinued
Once the 3-position system became standardized on most Benelli M4 variants, the 2-position version effectively became obsolete.
Today, most owners seeking collapsible functionality skip directly to a 3-position or aftermarket multi-position system.
The 3-Position Recoil Tube
Overview
The 3-position recoil tube is the most common and most desirable factory configuration for traditional Benelli M4 owners (non-EXT).
This is the recoil tube installed on most standard-production civilian Benelli M4 shotguns, even when they ship with a fixed polymer stock (field stock and pistol grip stock). This makes switching to a collapsible stock in the future straight-forward.
Polymer pistol grip stock on the left. Field stock on the right.
The Three Positions
The traditional Benelli C-stock works with:
- Fully collapsed
- Intermediate position
- Fully extended
This setup balances compactness and usability exceptionally well.
The middle position is especially useful when:
- Wearing body armor
- Running optics
- Shooting from vehicles
- Adjusting length of pull for different shooters
Why the 3-Position Tube Became the Gold Standard
The 3-position system is widely considered the ideal setup because it preserves:
- OEM aesthetics
- Military appearance
- Factory compatibility
- Proven durability
It works with the classic Benelli skeletonized collapsible stock that most enthusiasts associate with the platform.
Common Upgrade Path for M1014 Owners
A huge percentage of M1014 owners eventually replace the single-position tube with:
- OEM 3-position tubes
- U.S.-made multi-position aftermarket tubes
This converts the fixed “fake collapsible” stock into a fully functional collapsible system.
Aftermarket manufacturers later expanded the concept into 5-position and even 6-position compatible systems.
The 5-Position Recoil Tube (Benelli M4 EXT)
5-position recoil tube for EXT stocks
Overview
The 5-position recoil tube is the newest factory evolution of the M4 recoil system.
It has square cut notches rather than circular cut notches like the one, two, and three position tubes.
The classic aluminum stock adjusts different than the EXT polymer stock.
It was designed for the newer Benelli M4 EXT polymer collapsible stock system rather than the classic aluminum skeletonized C-stock. The new EXT stock is likely a cost saving measure as it is a one-piece injection molded stock instead of an aluminum stock with a polymer check rest.
This is a critical distinction:
- The OEM 5-position tube is NOT compatible with the classic aluminum M4 collapsible stock.
- The OEM 3-position tube is NOT compatible with the EXT polymer stock.
Key Differences
Aluminum Collapsible stock on the left, polymer EXT stock on the right.
Unlike the older round-profile tube used with the classic stock, the 5-position system uses a different geometry and locking interface.
Characteristics include:
- Five adjustment positions
- Polymer collapsible stock compatibility
- aster stock adjustment
- Different square locking notch design
- Modernized ergonomics
The newer system resembles the adjustable stocks used on some other Benelli tactical platforms such as the SuperNova and MR1.
Why Benelli Introduced It
The newer stock system improves:
- User ergonomics
- Ease of adjustment
- Compatibility with armor and optics
- Modern tactical preferences
Some users prefer the newer stock because adjustment is quicker and more intuitive than the rotating-lock mechanism of the traditional C-stock.
Others strongly prefer the original skeletonized stock for aesthetics and military authenticity.
Compatibility Issues You Should Know
This is where many owners make expensive mistakes.
Traditional C-Stock Compatibility
The classic Benelli skeletonized collapsible stock is designed around the 1, 2, and 3-position tube geometry.
It does NOT properly interface with the newer 5-position tube system, which caused considerable confusion when 5-position tubes first appeared on the market.
Before Buying Parts
Always verify:
- Which recoil tube your shotgun currently has
- Which stock system you intend to use
- Whether the stock and tube are designed together
Many aftermarket sellers now clearly separate:
- “Legacy M4 C-stock” tubes
- "M4 EXT / polymer stock” tubes
That distinction matters.
OEM vs Aftermarket Recoil Tubes
OEM Benelli Tubes
Advantages:
- Factory fitment
- Proper finish
- Historical authenticity
- Strong resale value
Disadvantages:
- Expensive
- Harder to source
- Sometimes restricted/import limited
Aftermarket Tubes
Advantages:
- Easier availability
- U.S.-made
- More position options
- better surface finishes
Disadvantages:
- Variable machining quality
- Occasional compatibility issues
- Finish may not perfectly match OEM guns
Removing a Benelli M4 Recoil Tube
Removing a factory Benelli recoil tube is notoriously difficult.
Benelli installs them with aggressive thread locker, and many owners underestimate the amount of heat required.
Common advice includes:
- Heat gun use
- Proper receiver blocks
- Strap wrenches or specialty fixtures
- Avoiding direct receiver damage
Improper removal can damage:
- Receiver threads
- Finish
- Recoil spring internals
Many owners choose to have gunsmiths perform the swap.
922(r) Considerations
For U.S. owners, changing stocks and recoil tubes can involve federal 922(r) compliance considerations.
A collapsible stock may require a certain number of U.S.-made parts depending on the configuration.
Always verify current federal, state, and local laws before modifying the shotgun.
Which Recoil Tube Is Best?
Best Traditional Setup
3-position tube with classic C-stock
Best Modern Ergonomics
5-position M4 EXT system
Best Upgrade for Early M1014s
OEM-style 3-position conversion
Final Thoughts
The Benelli M4 recoil tube system evolved significantly over the platform’s lifespan.
What began as a restricted civilian workaround eventually expanded into multiple configurations serving collectors, tactical users, competitors, and enthusiasts.
The 3-position system remains the classic and most recognizable configuration, while the newer 5-position M4 EXT setup reflects Benelli’s move toward modernized ergonomics and modularity.
Understanding the differences before buying stocks or recoil tubes can save substantial money and frustration — especially since many parts look similar but are not cross-compatible.