Wednesday, September 27, 2023

Mossberg 590M Heat Shield Mag-Fed Pump-Action Combat/Tactical Shotgun: Up to 20 rounds of 12-Gauge Firepower, and Quick Full-Capacity Reloads! (Videos!)

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By David Crane
david (at) defensereview (dot) com

May 31, 2018

DefenseReview (DR) has always been a big fan of combat/tactical shotguns, particularly for home defense. However, we weren’t really properly trained in their use until Steve Fisher of Sentinel Concepts taught us the right way to run a combat shotgun competently at Beretta Tactical Summit 2015. The course was a real eye opener, and made us much more confident in choosing a shotgun for certain dynamic CQB/CQC (Close Quarters Battle/Close Quarters Combat) gunfighting scenarios, like home defense, for example. Well, American heritage company Mossberg’s developed two shotguns that may just be the ultimate pump-action combat shotguns in the world, the Mossberg 590M Mag-Fed Shotgun and Mossberg 590M Heat Shield Mag Fed Shotgun.

Both Mossberg 590M Mag-Fed Shotguns will give you up to 20-rounds of 12-Gauge firepower and very fast full-capacity reloads to deal with whatever problem you’ve got. The only difference is that the Mossberg 590M Heat Shield Mag-Fed pump-action shotgun also gives you a nice-looking and functional perforated steel heat shield over the barrel, ghost ring combat sights (iron sights), and a “Tri-Rail” Mil-Std-1913 “Picatinny” rail underneath the pump-action grip, in case you want to mount a vertical fore grip. DR’s only concern with this last feature is that it might cause the pumping hand some discomfort, so we’d have to test it at the range. Other than than one question mark, the Heat Shield model is our current favorite, and it looks cooler.

For home defense, the Mossberg 590M Mag-Fed Shotguns are formidable, and there’s frankly nothing better that that loud pumping action to scare off an inttruder and would-be burglar before you actually have to shoot them in self defense. We’re not saying it’s a surefire deterrent, but it’s the best one we know, especially inside a structure, where sound is contained and magnified.

The Mossberg 590M Mag-Fed Shotgun mags (box magazines) are available in 5, 10, 15 and 20-round capacities, and Mossberg says that the mags will fit inside 7.62mm NATO (7.62x51mm NATO)/.308 Win. double-mag pouches.

Assuming they work as advertised and prove reliable, accurate and durable, Defense Review really digs these shotguns, and can’t wait to try them out at the range.

The following information on the Mossberg 590M Mag-Fed Shotguns comes from the company’s website:

590M® Mag-Fed


590M shotguns and magazines are uniquely designed incorporating stabilizing ribs that engage the magazine directly to the receiver for a sure lock-up. The 590M™ Series offers magazine-fed convenience in the legendary Mossberg pump-action tactical platform.

  • For home security, tactical, and competition applications, 590M Mag-Fed pump-actions offer many practical advantages: faster reloading/unloading, increased capacity without additional magazine tube length, and quick and easy transitioning between various types of loads (when using designated magazines).
  • Full magazines are the center of gravity point, making the 590M shotgun easy to balance for greater accuracy. The 590M is designed around the Mossberg 590,® the choice of tactical users worldwide and time-tested over decades of dependable service.
  • The features Mossberg tactical pump users expect are all there: Dual extractors, Twin action bars, Positive steel-to-steel lockup, Drilled and tapped receiver, Ambidextrous safety, and a Heavy-walled barrel.
  • 590M Accessory magazines are available in 5,10,15 and 20 shot capacity.

World’s First Double-Stack Shotgun Magazine Design 590M magazine’s patented design provides more capacity in less magazine length than competitor’s single stack designs. Offered in four capacities: 20, 15, 10 and 5-Round.

All-steel magazine release button and housing is optimally positioned in front of the trigger guard for quick, ambidextrous access for reloading — and will not interfere with cycling the action.

590M shotguns and magazines are uniquely designed incorporating stabilizing ribs that engage the magazine directly to the receiver for a sure lock-up.


The world’s first production double-stack 12GA shotgun magazine offers a shorter magazine length vs. capacity than competitor’s single-stack designs, providing better swing, balance and control.

  • Magazine construction highlights: Hardened steel feed lips, over-molded steel shell ramps, easy-grip external molded design, proprietary self-lubricating polymer magazine body material, heavy-duty ASTM-A-228 music wire magazine spring, removable floor plate for easy cleaning, and a tough black oxide finish on steel components.
  • For shooting flexibility, 590M magazines are available in 5, 10, 15, and 20-Round, and are for use with 2.75” shotshells.

Hardened steel feed lips and over-molded steel shell ramps ensure efficient feeding. Anti-cant rounded follower improves feeding; round limiter improves spring life.

Removable floor plate for easy cleaning; ASTM-A-228 music wire springs improve feeding, increase durability, and prolong service life.

Company Contact Info:

Corporate Headquarters:
O.F. Mossberg & Sons, Inc.
7 Grasso Avenue
North Haven, CT 06473
Tel: (203) 230-5300 | 8:00am-4:30pm Eastern
Fax: (203) 230-5420
Email Contact Page:

Service Inquiries:
U.S. (800) 363-3555 | 8:00am-4:30pm Eastern
Canada: (519) 509-4867 | Grech Outdoors
Law Enforcement: (203) 230-5355 | 8:00am-4:30pm Eastern

© Copyright 2018 (DR). All rights reserved. This material may not be published, broadcast, rewritten or redistributed without receiving permission and providing proper credit and appropriate links. If you are reading this article anywhere other than, please email us the website address/URL (where the unauthorized DR article reprint is located) at defrev (at) gmail (dot) com. Thank you.

All embedded (DR) photos and videos were shot with an Apple iPhone 6s Plus smartphone still/video camera.

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Mossberg 590M Heat Shield Mag-Fed Pump-Action Combat/Tactical Shotgun: Up to 20 rounds of 12-Gauge Firepower, and Quick Full-Capacity Reloads! (Videos!) by

About David Crane

David Crane started publishing online in 2001. Since that time, governments, military organizations, Special Operators (i.e. professional trigger pullers), agencies, and civilian tactical shooters the world over have come to depend on Defense Review as the authoritative source of news and information on "the latest and greatest" in the field of military defense and tactical technology and hardware, including tactical firearms, ammunition, equipment, gear, and training.

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