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Questions & Answers
Will this extension also fit the Turkish M4 clones? Manufacturer Answer

The thread configuration for this shotgun differs from the Benelli M4

by Carlsons Choke Tubes, Manufacturer, July 22, 2021
Can I add this to benelli m4 without going through all the 922r process? Thanx in advance! Manufacturer Answer

There are several factors that coincide with the 922R process. You will need to contact ATF or local law enforcement to see if you can install this extension and be compliant.

by Carlsons Choke Tubes, Manufacturer, August 3, 2022
Customer Reviews
Helpful Positive Review Great Extension for Benelli M4 by Nick, October 3, 2020
I did a lot of product review before trying this product. It fits my factory Benelli m4 perfectly. It replaces the black fake extension that comes on the shotgun and fits the threading perfectly. Using the shorter Benelli magazine spring, it increase...
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11/11 found this helpful
Helpful Positive Review Worth the price and well made. by Timothy Blankenship, Verified Owner, February 6, 2024
I ordered one of these for my MAC 1014 M4 clone and it does fit and works.
3/3 found this helpful
Helpful Positive Review Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension by Stephendh2000, Verified Owner, February 24, 2022
Good upgrade to the Benelli M4 with the faux 2 round extension. The most difficult part of the install is removal of the spring retainer cap inside the 5 round magazine tube. Not a big deal, but mine did not come with the follower even though Optic...
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2/2 found this helpful
Helpful Positive Review Worth the wait by Ottos Gramp, Verified Owner, March 5, 2021
The item arrived in what could be considered in this environment quickly. Carlson always has an excellent quality product and the installation when well. I didn’t use the new included spring, but remember when you change the magazine the original s...
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1/1 found this helpful
Helpful Negative Review Good quality part but! by Wnathan70, Verified Owner, January 19, 2024
The part was great quality but it did not fit my m4 it’s not the parts fault. I have a m4 clone and figured m4 parts were interchangeable to mine.
1/1 found this helpful
Most Recent Reviews Benelli M4 Clone: +2 Tube Extension by JLWII, Verified Owner, August 27, 2025
The tube extension does not work well with my Copolla T4 [Benelli M4 clone]. The tube extension does fully screw on to the choke tube. The tube extension itself does not allow the choke tube to fully screw all the way down to be properly seated onto ...
Read More...
Read All 18 Reviews
Color: Grey Finish: Blued Magazine Capacity: 7 RoundGun Make: Benelli Gun Model: Benelli M4 Condition: New

Code: 8C-MZX-04508-7RD

MPN: 04508

UPC: 723189045081

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Help support American manufacturing! Marked models of this product have gone through rigorous review and been certified by the manufacturer as Made in the USA.

Product Info for Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension

Carlson's Shotgun Magazine Extensions For Home Defense, Tactical and Law Enforcement Use, 12ga Onlyimage

Add firepower to your favorite shotgun. These magazine extensions are constructed of blued solid steel and come with spring, base clamp with swivel stud (included) to work with quick detachable swivel (not included), and a high visibility follower. The threaded tube replaces you magazine cap and gives you the ability to add extra rounds to you magazine. Easy to follow instructions are included. The magazine extension tube is great for home protection, competition shooting, and law enforcement. See chart below for the make/model and the magazine capacity.

Overall Length of Extensions: 04500 (8.25-inch), 04501 (10.5-inch), 04502 (6.25-inch), 04503 (6.375-inch), 04504 (14.25-inch), 04505 (8.25-inch), 04506 (6.25-inch), 04507 (8.25-inch), 04508 (5-inch), 04510 (13.88), and 04511 (8.5-inch), 04512 (8.38-inch), 04513 (8.13-inch), 04514 (14.13-inch), 04515 (8.13-inch), 04516 (14.13-inch), 04517 (8.5-inch), 04518 (14.25-inch)

**Magazine round count is for the total capacity using 2 3/4-inch shells including 1 in the chamber, when using 3" shells you lose 1 shell capacity. When using 3 1/2" shells you lose 2 shell capacity.**

Example: 8 shot extension= is 7 (2.75" shells) in the extension and 1 in the chamber, 6 (3" shells) in the extension and 1 in the chamber, or 5 (3 1/2" shells) in the extension and one in the chamber.

**Remington extensions require removal of tabs / detent in magazine tube on newer model shotguns**

All extensions are 12 gauge only.

Specifications for Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension:

Manufacturer: Carlson's Choke Tubes
Color: Grey
Finish: Blued
Fabric/Material: Steel
Magazine Capacity: 7 Round
Gun Make: Benelli
Gun Model: Benelli M4
Condition: New
Country of Origin: USA

Features of Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension:

  • Benelli M4 7 Shot Magazine Extension

Package Contents:

  • Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension
  • spring

Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension Orderable Models

List of Orderable Models

Carlson's Choke Tubes Shotgun Magazine Extension Assembly, Benelli M4, 12 Gauge, 7-Round, Grey, 04508 , MPN: 04508 , UPC: 723189045081 , Code: 8C-MZX-04508-7RD

Carlson's Choke Tubes Benelli M4 7- Shot Magazine Extension Unavailable & Discontinued Models

List of Unorderable Models

USED Carlson's Choke Tubes Shotgun Magazine Extension Assembly, Benelli M4, 12 Gauge, 7-Round, Grey, 04508, EDEMO19, Used, Condition Fair , MPN: 04508-EDEMO19 , Code: 8C-MZX-04508-7RD-EDEMO19
USED Carlson's Choke Tubes Shotgun Magazine Extension Assembly, Benelli M4, 12 Gauge, 7-Round, Grey, 04508, EDEMO20, Used, Condition Like New , MPN: 04508-EDEMO20 , Code: 8C-MZX-04508-7RD-EDEMO20
USED Carlson's Choke Tubes Shotgun Magazine Extension Assembly, Benelli M4, 12 Gauge, 7-Round, Grey, 04508, EDEMO21, Used, Condition Fair , MPN: 04508-EDEMO21 , Code: 8C-MZX-04508-7RD-EDEMO21
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