Magpul PMAG 20 AR 300 B GEN M3 - 300 BLK - BLK
Code: MAG1182-BLK
Product detailed description
Key Benefits
- Dedicated .300 BLK geometry – the internal profile accommodates the different projectile shapes used in this caliber.
- Visual and tactile identification – distinct ribbing and texture help distinguish it from 5.56mm versions.
- Accessible maintenance – the removable floorplate provides access for cleaning.
Intended Use and Application
Magpul PMAG 20 AR 300 B GEN M3 is a 20-round polymer magazine dedicated to .300 AAC Blackout. Its internal geometry and tactile body features distinguish it from 5.56mm magazines.
Caliber-specific construction
The body uses GEN M3 polymer construction, but this version is dedicated to .300 AAC Blackout. A marking panel supports individual identification. Its differences from a 5.56mm magazine go beyond the caliber marking.
Technical Specifications
- Capacity: 20 rounds
- Caliber: .300 AAC Blackout
- Platform: compatible AR15/M4 firearms in .300 BLK
- Material: polymer
- Generation: GEN M3
- Product code: MAG1182-BLK
- Color: Black (BLK)
Compatibility and Configuration
For .300 BLK firearms with the corresponding AR15/M4 magazine well. A matching magazine-well shape does not replace checking the firearm caliber.
Practical Note from neoPATRON
Keep .300 BLK magazines and ammunition clearly separated from 5.56mm. The different texture assists identification but does not replace a caliber check.
AlwaysSecond comment: I like Magpul accessories for how well thought-out they are. Together with BCM and B5, they form the top 3 manufacturers in this segment. Magpul is the most widespread and has the strongest marketing. But these products are not built on marketing (like, for example, DD products), but on excellent functionality, durability, quality, and smart design. That’s why I like them alongside BCM and B5. Simply "no beating around the bush" and also "no DD brain washing" – just the "real deal". Practical, durable, well thought-out, ergonomic… what more could you ask from AR accessories?
Michal "AlwaysSecond" Vavrečka
Czech national shooting representative
14-time Czech vice champion and "curiositist"
"AlwaysSecond – Your first choice"
Magpul Industries USA – the standard of modern accessories for AR platforms, proven in real-world use worldwide
Magpul Industries is one of the most respected manufacturers of firearm accessories in the world. What started as a simple tool for improved magazine handling has evolved into a complete ecosystem of products that today define the standard of modern equipment for AR platforms and other firearms.
The brand has built its position on functionality, simplicity, and real-world usability. Magpul products are not designed for visual effect, but for everyday use – they perform reliably across a wide range of conditions and maintain consistent quality over time.
Today, Magpul is synonymous with practical solutions that make sense – from PMAG magazines, to stocks and grips, to accessories built around the M-LOK system, a standard the company itself developed and successfully established across the industry.
Why choose Magpul products:
- Proven (above) standard – PMAG magazines are among the most widely used in the world and set the benchmark for reliability and compatibility
- Functionality without compromise – products designed for real-world use, not for marketing catalogs or polished photos
- M-LOK system – a well-designed, modular, and widely adopted mounting solution
- Made in USA – unlike competing “marketing brands manufactured in China”
- Wide product ecosystem – components that work together and allow easy configuration of a functional setup
- Controlled compatibility – products designed to work across platforms and generations
Why buy from neoPATRON:
✔ Authorized distribution – we work directly with the manufacturer through official distribution channels and keep products in stock✔ Expertise – we use these products ourselves and know what works and what makes sense
✔ Extended services – we can assist with product selection and combinations beyond the standard offer
✔ Stock availability – we strive to maintain inventory so you don’t have to rely on alternative brands
✔ Competitive pricing – fair conditions for retail partners and strong pricing for end customers
✔ Reliable customer service – you can count on us to respond and follow up without delays