Mossberg Factory OEM 590M Series Detachable Magazine - 20-Round Capacity - Fits 590M Mag-Fed Shotguns - 12 Gauge, 2.75" Shells, Carbon-Fiber Reinforced Polymer, Matte Black Finish - Item 95140
Product Description
If you have ever tried running a high-volume defensive course or managing a dynamic wildlife control scenario with a standard pump-action shotgun, you know that thumb-loading individual shells into a traditional under-barrel tube is slow. Fumbling with loose shells while your target cycles can leave you stranded on your staging bench. The **Mossberg® Factory OEM 590M 20-Round Detachable Magazine (95140)** completely eliminates this bottleneck. It transitions your pump-action platform into a mag-fed system that lets you load a massive 20 rounds of 12-gauge force in a single motion.
Proudly engineered and manufactured in the United States to uncompromised duty-grade standards, this ultra-high-capacity magazine features a patented, double-stack column design that tapers into a single-position feeding mouth. The chassis body is molded from an advanced, proprietary **carbon-fiber reinforced polymer matrix** that resists extreme crush forces, dynamic drops, and cold-weather impacts. The upper section features precision-formed, steel-reinforced locking lugs that engage smoothly with the 590M receiver, while the self-lubricating, anti-tilt follower is driven by a heavy-duty music wire spring to feed heavy buckshot, slugs, or target handloads flawlessly.
Outfitted with aggressively textured external ribbing along the casing walls, this massive magazine ensures a secure grip during high-speed swaps right on your workbench.
*Armorer Bench Notes & Real-World Shotgun Staging Guidance: The Mossberg 95140 factory replacement magazine arrives complete and individually protected inside its original retail display packaging. CRITICAL CO-DEPENDENT FIREARM FITMENT MATRIX: This magazine is engineered strictly and exclusively to lock into the **Mossberg 590M (Mag-Fed) shotgun family, including the 590M Tactical and 590M Shockwave variants** featuring factory-installed magazine wells on your bench. ABSOLUTE INCOMPATIBILITY WARNING: This module will not fit standard tube-fed Mossberg 500, 590, or 930 models, nor will it interface with alternative mag-fed shotguns like the Remington® 870 DM or Saiga-style platforms due to proprietary receiver lockup paths. Ammunition Dimensional Parameters: This magazine is tuned strictly for 12-Gauge, 2.75-inch (70mm) shells. *Armorer Warning Note:* Do not attempt to load 3-inch or 3.5-inch magnum shells into this body, as the longer hull will bind inside the tracking channel and cause catastrophic feeding failure. Armorer Workbench Staging & Loading Sequence: 1. Ensure your shotgun is completely empty, safety on, action closed, and clear of live ammunition. 2. When loading shells by hand, push the rim of the shell straight down into the center of the follower, then slide it rearward under the steel feed lips. 3. To insert into the firearm, tilt the front alignment spine of the magazine into the forward notch of the receiver magwell first, then pivot the rear upward until the dual side latches click rigidly home. Field Maintenance Advice: Given the massive spring tension required to push twenty heavy 12-gauge cartridges upward, never store this magazine fully loaded for multi-month stagnation blocks to ensure maximum spring life. Clean the interior by sliding off the floorplate; wipe down the walls with a dry microfiber cloth, and never apply liquid gun oil inside the channel, as sticky oil captures plastic hull shaving debris and burnt powder soot downrange.*
Key Features
- Massive 21-Shot Capability: Holds 20 rounds of 12-gauge shells in the magazine plus 1 in the chamber, completely flatlining traditional pump-action reloading limits.
- Carbon-Fiber Reinforced Shell: Molded from a rugged, lightweight polymer composite matrix that withstands heavy tactical impact forces and hard trail drops.
- Genuine Mossberg Factory OEM: Formulated and built in the USA to exact factory blueprint specs, ensuring absolute lockup alignment and optimal cycle speeds.
- Steel-Reinforced Feed Lips: The upper dual-sided indexing teeth are embedded with hardened steel inserts to prevent lip spreading or warping under full spring load.
- Anti-Tilt Low-Friction Follower: Outfitted with an advanced, self-lubricating follower that glides smoothly along the inner channels, cutting out shell nose-dives.
- Aggressive External Grasp Ribs: Designed with prominent structural waffle ribbing across the body faces to guarantee a non-slip grip during quick winter swaps.
Product Specifications
- Brand: Mossberg® (O.F. Mossberg & Sons - North Haven, Connecticut)
- Model Line: Factory OEM 590M Detachable High-Capacity Ammunition Feeding Series
- MPN/SKU: 95140 (Also cataloged as MOS-95140-BLK)
- UPC Code Profile: 015813951401
- Shotgun Platform Fitment: Mossberg® 590M (Mag-Fed) Shotguns and 590M Shockwave Frameworks Only
- Standard Shell Capacity: 20 Rounds (Double-stack staggered column layout spec)
- Compatible Ammunition Caliber: 12 Gauge Only (Optimized for 2.75-Inch / 70mm Shell Lengths)
- Magazine Housing Material: Proprietary High-Tensile Carbon-Fiber Reinforced Polymer Composite Matrix
- Feedway Structural Inserts: Precision Embedded Hardened Steel Feeding Lips Component
- Follower Component Style: High-Visibility Black Self-Lubricating Anti-Tilt Polymer Follower
- Internal Spring Configuration: Elongated Heavy-Duty High-Tension Tempered Music-Wire Coil Spring
- Exterior Finish Dressing: Non-Reflective Matte Textured Black Finish Layer
- Ammunition Load Options: Accepts standard 12ga 2.75" Buckshot, Slugs, and Target Loads
- Full Kit Component Checklist: Completed 20-Round 590M Poly Magazine Assembly, Retail Packaging
- Packaging Format Class: Factory Retail Peg-Hang Clamshell Blister Card Packing
- Product Type Category: Shotgun Components / Shotgun Ammunition Magazines & Drums
- Overall Body Silhouette Profile: Curved Extended High-Capacity Sub-Receiver Module
- Net Component Module Mass: ~21.50 Ounces (~609.5 Grams Heavy-Duty Empty Poly Assembly Weight)
- Country of Manufacture: Proudly Sourced, Machined, and Crafted in the United States of America
- Warranty Tracking Protection: Fully Backed by Mossberg Factory Parts Warranty Support
