Benelli M4 Magazine Extension

Benelli M4 2-Round Magazine Extension – Titanium: 

Quick Overview:

• Precision machined from aircraft grade titanium alloy.
• Adds two additional rounds to your Benelli M4 5-round tube.
• Easy Installation: replaces the OEM false magazine extension.
• Light Weight: only 1.9oz (54g), reducing the weight at the muzzle end.
• Length: 6.5” (adds 4.5” to the OEM 5rd tube).

Crafted from ultra-strong, ultra-lightweight titanium. Our titanium magazine extensions are nearly half the weight as steel 2-round magazine extensions. It is even lighter than the false aluminum OEM 2-round magazine extensions. Titanium also has the added benefit of being virtually rust and corrosion-proof. Our titanium magazine tubes are precision CNC machined and Cerakoted in the USA.

Colors:

• Black: is a custom dark gray cerakote that can be darkened with a light layer of gun oil
• H2O: is a custom titanium colored cerakote to nearly perfectly match the “H2O” or “Titanium Cerakote” Benelli M4’s

Clone Compatibility: This magazine extension is made specifically for the Benelli M4 and is not guaranteed to fit any clones. However, according to customer feedback, here is the list of clone's fitments:

• MAC 1014 – YES
• Panzer M4 – NO
• Black Aces S4 Pro – YES
• Aska M4 – YES
• SDS Tac12 – YES
• SDS S4 – NO
• Sulun Tac12 – YES
• Gforce Arms M4 – NO

Benelli M4 7-Round Magazine Tube – Titanium:

Quick Overview:

• Precision machined from aircraft grade titanium alloy.
• Adds two additional rounds to your Benelli M4.
• Completely replaces the OEM 5rd tube and 2rd limiter for a sleek form.
• Light Weight: only 4.9oz (139g), reducing the weight by 5.3oz (151g) compared to 5rd tube and limiter.
• Length: 18.25”

Crafted from ultra-strong, ultra-lightweight titanium. Our titanium Magazine tubes are nearly half the weight as our steel tubes, and they are higher strength. Titanium also has the added benefit of being virtually rust and corrosion-proof. Our titanium magazine tubes are precision CNC machined, assembled, and Cerakoted in the USA from imported titanium alloy. The titanium extended tube weighs in at less than half of the weight as the OEM 5rd tube and 2rd limiter.

Colors:

• Black: is a custom dark gray cerakote that can be darkened with a light layer of gun oil
• H2O: is a custom titanium colored cerakote to nearly perfectly match the “H2O” or “Titanium Cerakote” Benelli M4’s

Clone Compatibility: This magazine tube is made specifically for the Benelli M4 and is not designed to fit any clones. However, according to customer feedback, here is the list of clone's fitments:

• Panzer M4 – NO
• MAC1014 – YES

Benelli M4 7-Round Magazine Tube – Steel:

Quick Overview:

• Precision machined from aircraft grade steel alloy.
• 100% made in the United States for 922r compliance.
• Engraved "MADE IN USA" in large letters.
• Adds two additional rounds to your Benelli M4.
• Completely replaces the OEM 5rd tube and 2rd limiter for a sleek form.
• Light Weight: only 9.0oz (256g), reducing the weight by 1.2oz (33g) compared to 5rd tube and limiter.
• Length: 18.25”

Machined from strong, lightweight chromoly steel. Our steel magazine tubes are precision CNC machined, assembled, and Cerakoted in the USA from domestic steel making them 922r compliant. They are engraved "MADE IN USA" in large letters for easy identification. 

Colors:

• Black: is a matte black oxide that matches the Parkerized barrel very closely. 
• H2O: is a custom titanium colored cerakote to nearly perfectly match the “H2O” or “Titanium Cerakote” Benelli M4’s

Clone Compatibility: This magazine tube is made specifically for the Benelli M4 and is not designed to fit any clones. However, according to customer feedback, here is the list of clone's fitments:

• Panzer M4 – NO
• MAC1014 – YES

Recommended Wolff Magazine Spring Upgrade:

It is recommended to also upgrade your spring to the Wolff Magazine Spring when increasing capacity of your Benelli M4. This spring improves the reliability of your shotgun compared to the OEM spring that comes with your 5-round tube and limiter. It has increased power, and also takes up less room in the magazine compared to the Benelli factory spring.

The Benelli M4 factory spring is hit or miss when increasing magazine capacity; some owners say it cycles fine, while others have cycling issues. Usually newer OEM springs work fine, but after being used for some time, they tend to take a set and become underpowered and start having reliability issues.

Benelli M4 2rd Magazine Extension Installation: 

1. Switch to safe, and remove all rounds from the: chamber, loading gate, magazine tube, and work area. Use proper personal protective equipment.
2. Field strip your Benelli M4.
3. Use snap ring pliers and remove the spring retaining ring (careful, it’s under spring tension).
4. Install the spring retaining ring into the new magazine extension.
5. Insert the spring and screw on your new magazine extension.
6. Reassemble your Benelli M4

Benelli M4 7rd Magazine Tube Installation: (PDF)

1. It is recommended that you have a qualified gunsmith install this part. We are not responsible for any damage to you or your shotgun. Use proper personal protective equipment.
2. Switch shotgun to safe, and remove all rounds from the: chamber, loading gate, magazine tube, and work area.
3. Remove: magazine cap, barrel, foregrips, retaining ring, magazine spring, magazine follower, bolt carrier group, and trigger assembly.
4. Place the receiver in a padded vice and heat up the OEM magazine tube to melt the thread locker using a heat gun (or torch if you’re careful). Try to only heat the tube and not the receiver.
5. Once the thread locker starts to smoke, use heat resistant gloves and unscrew the tube.
6. Install your new Benelli M4 extended tube the same way it was disassembled and add a drop or two of all metal, high strength thread locker.

Benelli M4 Magazine Extension Tube Capacity:

The Benelli M4 magazine extension tubes will fit seven 2-3/4” shells, or six 3” shells. To fit a total of nine 2-3/4” shells or eight 3” shells, you will need to Ghost Load your M4.

Can’t fit 7 Rounds into your Mag Tube?

The measurement of a shotgun shells is the length of the shell after it has been fired (or before it was crimped by the manufacturer). Some unfired shells are longer than others (They are all close to 2.75” after spent). 

Unfired 2-3/4” rounds vary in length from about 2.25”, all the way up to 2.5” due to different style of crimping by the manufacturer. Unfired target/birdshot ammo tend to be shorter than high-brass/defensive ammunition. A good rule of thumb is if your shells are longer than 2-5/8”, you won’t be able to fit all 7 shells into the tube. However, there are ways to fit seven longer length shells if you don’t want to try different ammo:

1. Install the spring retaining ring only partially to where it’s sticking out of the end of the magazine extension. Then, when you reassemble your shotgun, the magazine cap will push it down to the maximum position.
2. Remove the spring retaining ring from the end of the magazine extension entirely (just remember in the future that the spring will shoot out when you take off the magazine cap if you’re not careful).
3. Upgrade to the Max Room Follower which has a thinner design than the OEM follower.
4. Upgrade to the Wolff magazine spring which has a slightly shorter solid length (fully compressed length) than the OEM spring
5. Upgrade to a magazine cap that has more space hollowed out.

Note: All magazine tubes on this page do not ship to NJ or MA.