Description
Magpul 300 Blackout magazine for sale — the PMAG 30 AR 300 B GEN M3 is a purpose-built 30-round polymer magazine for compatible rifles chambered in .300 AAC Blackout. Its dedicated design supports reliable feeding with the wide range of bullet weights and profiles commonly used in 300 BLK ammunition.
The Magpul 30 round 300 BLK magazine offers a more reliable and practical alternative to using a standard 5.56 magazine for .300 Blackout. Its optimized internal geometry is designed specifically for 300 AAC Blackout cartridges, helping support consistent performance across different loads.
A distinct ribbed body and smoother upper-half texture make this 300 Blackout rifle magazine easy to identify by sight and touch. This difference helps reduce the risk of confusing a 300 BLK magazine with a 5.56 magazine during storage, loading, or range preparation.
The PMAG 30 AR 300 B GEN M3 features impact- and crush-resistant polymer construction for dependable durability without unnecessary weight. Aggressive front and rear texturing improves grip, while the slim removable floorplate makes cleaning and maintenance simple.
A paint-pen dot matrix allows you to label the magazine, and the included dust and impact cover helps protect it during storage and transport. The black finish gives this Magpul PMAG 30 300 Blackout magazine a clean appearance that complements most AR-style rifles.
Key features
- 30-round capacity.
- Designed specifically for .300 AAC Blackout.
- Compatible with selected AR-15 and M4-pattern rifles.
- Optimized internal geometry for varied 300 BLK bullet profiles.
- Ribbed design for visual and tactile identification.
- Helps reduce the risk of 300 BLK and 5.56 magazine mix-ups.
- Impact- and crush-resistant polymer body.
- Aggressive front and rear gripping texture.
- Slim, easily removable floorplate.
- Paint-pen marking grid for identification.
- Dust and impact cover included.
- Black finish.
- Made in the USA.
Product specifications
- Brand: Magpul
- Series: PMAG 30 AR 300 B GEN M3
- Model: MAG800-BLK
- Capacity: 30 rounds
- Caliber: .300 AAC Blackout
- Material: Polymer
- Finish: Black
- Type: Detachable rifle magazine
Confirm that your rifle is chambered for .300 AAC Blackout and verify compatibility with the specific firearm before use. Always keep 300 BLK and 5.56 ammunition clearly separated, since using the wrong cartridge in a firearm can cause serious damage or injury.






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