Your basket is empty.

Basket

Help and contact

Free standard delivery over £199

100-day return policy

Newsletter

Sale

Over 300,000 customers - we say thank you!

4.93/5 "Very good" (1400+ reviews)

40,000+ products for hunting and shooting sports

Transform your Mossberg 500 into a tactical powerhouse with an 8-round magazine, 20" smoothbore barrel, and reliable feeding for self-defense.

MOSSBERG 500 HIGH CAPACITY SHOTGUN KIT W/FRONT BEAD SIGHT

631000339

Restrictions

Is a 'Call to order' product.

Top takeaways

The kit transforms a Mossberg 500 into a high-capacity, 12 gauge self-defense shotgun with an 8-round magazine extension.
It includes a 20-inch barrel with a fixed cylinder choke suitable for 2¾" and 3" magnum loads and a plain brass bead front sight.
The magazine extension securely attaches to the receiver, and the kit comes with an extended-length magazine spring for reliable feeding.

Attributes

Capacity:
```
8-Round
```
Gauge:
```
12 Gauge
```
Model:
```
500
```
Weapon type:
```
Mossberg
```
Delivery weight: 1.479kg
Shipping height: 57mm
Shipping width: 89mm
Shipping length: 965mm

Item details

Made in USA
US export classification: 0A502

Specifications:
Capacity: 8-Round
Gauge: 12 Gauge
Make: Mossberg
Model: 500

259.9 259.9 1 GBP

259.9 GBP £259.90

Prices inclusive of duty & VAT.

Product no.: 631000339

High quality, OEM components allow you to easily transform your Mossberg 500 into a reliable, high-capacity, self defense weapon. 20" long barrel chambered for 2¾" and 3" magnum 12 gauge loads features a fixed cylinder choke for maximum pattern coverage at combat ranges. Plain brass bead front sight for fast easy sight acquisition. Magazine extension threads solidly into the receiver to provide 8-rounds of firepower; knurled takedown screw retains the tube in the magazine support on the barrel to eliminate the need for a separate barrel clamp. Includes extended-length magazine spring for reliable feeding.

Not available

Not available.

100-Day Return Policy

No charges until we ship

No charge:
Your credit card will not be charged when you place your order.

No commitments:
You are under no obligation until the goods are shipped. You can cancel your order at any time before shipping - free of charge.

Not until shipping:
Your credit card will only be charged once we ship your order. Not before.

Wish List Ask question

order by phone

259.9 259.9 1 GBP

Description Specification Customers reviews Accessories

MOSSBERG 500 HIGH CAPACITY SHOTGUN KIT W/FRONT BEAD SIGHT

259.9 GBP £259.90

Prices inclusive of duty & VAT.

Is a 'Call to order' product.

Requires order by phone

Description:

Transform Your Mossberg 500 Into A Tactical Powerhouse

High quality, OEM components allow you to easily transform your Mossberg 500 into a reliable, high-capacity, self-defense weapon. The 20" long barrel, chambered for 2¾" and 3" magnum 12 gauge loads, features a fixed cylinder choke for maximum pattern coverage at combat ranges.

Features:

Plain brass bead front sight for fast and easy sight acquisition.
Magazine extension threads solidly into the receiver, providing 8 rounds of firepower.
Knurled takedown screw retains the tube in the magazine support on the barrel, eliminating the need for a separate barrel clamp.
Includes extended-length magazine spring for reliable feeding.

Specifications:

Barrel: Steel, blued finish, 20” (51cm) long, smoothbore, fixed cylinder choke with rifle sights, compatible with 2¾” & 3” magnum 12 gauge.
Extension Tube: Steel, blued finish, 8-round capacity.
Magazine Spring: Piano wire, extended length.
Compatibility: Kit fits Mossberg 500, 12 gauge receivers only.

Restrictions

Is a 'Call to order' product.

Top takeaways

The kit transforms a Mossberg 500 into a high-capacity, 12 gauge self-defense shotgun with an 8-round magazine extension.
It includes a 20-inch barrel with a fixed cylinder choke suitable for 2¾" and 3" magnum loads and a plain brass bead front sight.
The magazine extension securely attaches to the receiver, and the kit comes with an extended-length magazine spring for reliable feeding.

Attributes

Capacity:
```
8-Round
```
Gauge:
```
12 Gauge
```
Model:
```
500
```
Weapon type:
```
Mossberg
```
Delivery weight: 1.479kg
Shipping height: 57mm
Shipping width: 89mm
Shipping length: 965mm

Item details

Made in USA
US export classification: 0A502

Customers reviews

Customer ratings (0)

0 / 5

Oops! Something went wrong.

We encountered an error while loading this content. Please refresh the page to continue. If the issue persists, contact our customer support.

Site Navigation

Product Categories

Ordering

Customer Service

Connect

Secure payment methods

Trade Associations

Welcome!

to Brownells UK, your destination for anything gun related. With our roots in a genuine passion for firearms, we bring you an unmatched selection of Gun Parts, Firearm Accessories, Gunsmithing Tools, Scopes & Red Dot Sights and Expert Knowledge.

Whether you're looking to maintain, repair, or upgrade, we've got what you need!

For Shooters, By Shooters
We share your enthusiasm and know exactly what you're looking for because we're part of the community.

Massive Selection
From the essentials to the unique, find everything under one roof.

Our blend of tradition and innovation
Shop with the convenience of modern technology, backed by a legacy of experience.

Browse our collection and discover why we're the trusted name in shooting sports & hunting.