Magpul® PMAG® 20 AR 300 B GEN M3™ 20-Round .300 Blackout Magazine – Compact Subgun & Prone Profile – Purpose-Built Internal Geometry – Tactile & Visual Safety Differentiation – Matte Black – MAG1182-BLK
Product Description
The Magpul® PMAG® 20 AR 300 B GEN M3™ 20-Round .300 Blackout Magazine (MAG1182-BLK) represents an elite benchmark in modern intermediate-caliber feeding logistics, tactical small-arms safety engineering, and compact host platform staging, proudly designed and manufactured in the USA. Explicitly engineered from the ground up to support the unique physical parameters of the .300 AAC Blackout (300 BLK) cartridge, this dedicated hard-use magazine masterfully eliminates the historic compromises of multi-caliber magazine adaptation. While legacy 300 BLK shooters historically relied on standard 5.56x45mm NATO magazines due to basic case structural similarities, doing so creates an inherent mechanical bottleneck. Heavy subsonic projectiles (such as 220-grain payloads) possess broad, thick ogive profiles that press directly against the internal guide ribs of a traditional 5.56 mag, forcing the stack to turn inward, bind up the follower path, and trigger catastrophic failure-to-feed (FTF) cycles. The MAG1182-BLK completely deletes those vulnerabilities, replacing compromised geometry with a flawless, dedicated feeding corridor.
The core performance triumph of this 20-round tactical module centers on its optimized internal constant-curve tracking geometry and heavy-duty GEN M3 composite formulation. Molded from Magpul's proprietary next-generation impact- and crush-resistant polymer, the magazine shell handles intense drop shocks, sub-zero cold fields, and crushing vehicular pressures without micro-fracturing or feed lip spread. The customized interior clear path supports the wide, erratic structural variance of everything from lightweight 110-grain supersonic varmint loads up to long, heavy-grain subsonic suppressed ammunition. By containing a long-life, heavy-duty stainless steel spring and a four-way anti-tilt follower, the magazine ensures that every single round is driven upward at the precise angle needed to clear your upper receiver's feed ramps, securing maximum cyclic speed across rapid-fire strings.
The true operational victory of this American-built masterclass magazine lies within its **integrated life-saving visual and tactile safety differentiation design and space-optimized footprint**. Cross-loading a .300 Blackout round into a 5.56mm chamber by mistake results in immediate, catastrophic overpressure barrel explosions ("Ka-Boom!") that destroy the firearm and risk operator injury. To prevent this, Magpul molded the 300 B series with a **distinctive external rib pattern and a smooth upper-half texture**, giving armorers instant, non-visual tactile confirmation of their chambering type even in pitch-black low-light conditions. The compact 20-round length reduces total vertical frame height, making it an invaluable asset for shooting from a prone bipod position, navigating tight vehicle cabins, or maximizing concealment loops inside compact PDW gear bags. Complete with a paint-pen dot matrix panel and an included snap-on impact/dust cover, this premium feeding asset grants you absolute command over your short-format weapon configuration.
Includes: (1) Authentic Magpul PMAG 20 AR 300 B GEN M3 20-Round Magazine (Matte Black Next-Gen Polymer Body, Four-Way Anti-Tilt Follower, Stainless Steel Internal Spring), and (1) Removable Snap-On Impact/Dust Cover, Packed in Original Branded Factory Sealed Retail Packaging.
*Administrative Staging, Capacity Compliance & Cross-Loading Protection Guidance: The Magpul MAG1182-BLK is a dedicated capacity feeding module. **CRUCIAL LEGAL & REGULATORY COMPLIANCE WARNING:** This product possesses a 20-round capacity and cannot be shipped, transferred, or sold to restrictive municipal jurisdictions that enforce strict 10-round magazine capacity limits (including California, Colorado, Connecticut, Hawaii, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, and Washington D.C.). This magazine is optimized exclusively for rifles chambered in .300 Blackout; **never attempt to force-load 5.56x45mm NATO or .223 Remington cartridges inside this tracking track, as internal timing issues will occur**. Utilize the integrated bottom paint-pen dot matrix to apply distinct color codes to your magazines for an added layer of administrative safety. Always explicitly verify that your firearm chamber and current workspace are free of live cartridges before executing bench storage sorting drills.
Key Features
- **Purpose-Built 300 BLK Track:** Engineered with proprietary internal dimensions explicitly tailored for .300 Blackout bullet ogives, preventing internal stack binding and feeding failures.
- **Tactile & Visual Differentiation:** Distinctive external rib geometry and a unique upper-half smooth texture provide instant, unmistakable hand-verification to eliminate dangerous cross-loading errors.
- **Maneuverable 20-Round Footprint:** Compact, shortened length minimizes bulk, providing ideal ground clearance for prone benchrest shooting and maximizing pack concealment loops.
- **Next-Gen Polymer Core:** Molded from Magpul's benchmark impact- and crush-resistant polymer formula to preserve total feed-lip structural integrity under extreme field usage.
- **Premium Stainless Steel Spring:** Long-life internal spring wire operates in perfect harmony with a low-friction, four-way anti-tilt follower to ensure consistent upward kinetic delivery.
- **Identification Dot Matrix:** Built-in lower paint-pen dot matrix panel allows armorers to cleanly scratch numerical tracking marks or caliber markers that resist field cleaning solvents.
Product Specifications
- **Brand:** Magpul® Industries (Precision engineered, molded, and multi-stage endurance tested natively in the USA)
- **Product Line:** PMAG® GEN M3™ High-Performance Polymeric Small Arms Feeding Systems
- **Model Series Designation:** PMAG 20 AR 300 B GEN M3 – .300 Blackout Edition
- **SKU / MPN:** MAG1182-BLK (Alternative Industry Identifiers: MAG1182 / MAG1182BLK / 100-042-365)
- **UPC Barcode Number:** 840815132233
- **Firearm Chamber Fitment:** Rifles and Short Barreled Pistols chambered in .300 AAC Blackout
- **Receiver Interface Standard:** Standard MIL-SPEC AR-15, M4, M16, and STANAG 4179 Magwell Platforms
- **Alternative Weapon Fitment:** FN SCAR® MK 16/16S, IWI® Tavor, HK® 416, and similar clone variants
- **Payload Volumetric Capacity:** 20 Rounds (Compact Intermediate Flush Tracking Volumetric Capacity)
- **Chassis Housing Material:** Next-Generation Impact-Resistant Proprietary Technical Polymer Matrix
- **Internal Follower Class:** Self-Lubricating, Low-Friction Four-Way Anti-Tilt Polymer Follower
- **Recoil Spring Composition:** High-Tensile, Heavy-Duty Tempered Stainless Steel Coil Spring
- **Floorplate Geometry:** Slim-Line Removable Floorplate (Compatible with Magpul Tactile Lock Plates)
- **Environmental Shield Included:** Snap-On Impact Transmission / Debris Dust Cover Shroud
- **Product Net Component Weight:** ~4.20 oz (~0.26 lbs) Bare Unloaded Magazine Shroud
- **Total Packaging Shipping Mass:** ~0.45 lbs (Enclosed Inside Original Factory Branded Protective Retail Bagging)
