Benelli M4 Magazine Extension +2 Round

Benelli M4 2-Round Magazine Extension – Titanium

The Benelli M4 ships from the factory with a false aluminum limiter plugging your magazine tube — blocking two rounds of capacity that are already built into the gun. The Shell Tactical 2-Round Magazine Extension replaces that limiter, bringing your M4 from 5+1 to 7+1 capacity with a direct screws-on installation that requires no gunsmithing, no heat gun, and no permanent modifications to your shotgun.

This is the simpler path to 7 rounds. Your OEM 5-round tube stays in place. The limiter comes out, the extension screws on, and you're done.

Click Here for full length 7rd Benelli M4 magazine tube.

Titanium Extension Tube

The titanium extension is precision CNC machined from aircraft-grade titanium alloy and Cerakoted in the USA. At just 1.87oz (53g), it's lighter than the false aluminum OEM limiter 2.47oz (70g) it replaces — meaning this upgrade actually reduces muzzle weight while adding capacity. Virtually rust and corrosion-proof.

Specifications:

• Length: 6.5" (adds 4.5" to the OEM 5-round tube)
• Titanium weight: 1.87 oz (53g)
• Capacity: 7 rounds of 2¾" shells / 6 rounds of 3" shells

Colors:

• Black: custom dark gray Cerakote — can be darkened further with a light layer of gun oil
• H2O: custom titanium-colored Cerakote to closely match the Benelli M4 H2O / Titanium Cerakote finish

Installation:

1. Clear and safe the firearm. Field strip your M4.
2. Using snap ring pliers, remove the spring retaining ring from the OEM limiter (caution — it's under spring tension).
3. Transfer the spring retaining ring into the new extension.
4. Insert the spring and thread on the extension.
5. Reassemble your M4.

Recommended upgrade: The Wolff Magazine Spring is strongly recommended when running extended capacity. The OEM Spring is adequate when new but tends to take a set with use, leading to cycling issues. The Wolff Spring has increased power and has a shorter solid length — the better choice for any extended tube setup.

Can't fit 7 rounds? Click Here.

Clone compatibility (based on customer feedback — not guaranteed):

• MAC 1014 – YES (sometimes; the 7-round tube is more reliable on this platform)
• Black Aces S4 Pro – YES
• Aska M4 – YES
• SDS Tac12 – YES
• Sulun Tac12 – YES
• Panzer M4 – NO
• SDS S4 – NO
• Gforce Arms M4 – NO

Not sure whether to go with the 2-round extension or the full 7-round magazine tube replacement? If you want the simpler install and want to keep your OEM tube, this is the right choice. If you want the lightest possible setup, the cleanest look, or 922r compliance from this part, see the Benelli M4 Magazine Tube - 7rd.

Note: No magazine extensions over 5 rounds ship to NJ or MA.