STEYR ARMS Magazine for AUG A3 · 10 rounds · .223 Rem. / .300 BLK

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AUG accessories · 10-round magazine
Long 10-round magazine for STEYR AUG A3 in .223 Remington and .300 AAC Blackout
AKAH offers this long AUG A3 magazine with a 10-round capacity. The additional caliber designation .300 AAC Blackout is confirmed by STEYR: .300 BLK and 5.56 × 45 / .223 Remington generally use the same magazine type in the AUG.

Black Raptor organizes model-specific accessories by platform, interface, and documented technical data. This helps you find the version that matches your equipment mechanically and functionally.
Black Raptor assessment
The shared magazine design is technically confirmed, but it increases the risk of mix-ups. STEYR explicitly warns against mixing ammunition and barrel calibers and recommends using separate, clearly distinguishable magazines for each caliber.
Fit and purchase checklist
For compatible STEYR AUG A3 versions with a standard AUG magazine well in .223 Remington / 5.56 × 45 or .300 AAC Blackout. Check the firearm model, magazine well, and caliber marking on the barrel.
Available versions
10 rounds · .223 Rem. / 5.56 × 45 / .300 BLK
Technical specifications

Platform: STEYR AUG A3 with standard AUG magazine well
Capacity: 10 rounds
Long magazine version
Caliber: .223 Remington / 5.56 × 45 and .300 AAC Blackout according to STEYR
Separate caliber markings are expressly recommended

Installation and use
Completely unload the firearm, open the bolt, and check the chamber. Insert the empty magazine and check that it locks in place and can be removed. Then load it only with ammunition that exactly matches the caliber marking of the
fits the mounted barrel.
User tip: Use different colors or clearly visible magazine markings for .223 Remington and .300 BLK, and store both calibers strictly separately.
Important limitation: .300 BLK can feed in a .223/5.56 barrel and vice versa, but must never be fired in either. Permanently and clearly mark magazines differently for each caliber.
Who is it suitable for?
For responsible users whose specific platform and interface clearly match the product details.
Not suitable if the model generation, mounting interface, caliber, or size differs.
Conclusion: Long 10-round magazine for STEYR AUG A3 in .223 Remington and .300 AAC Blackout—clearly specified technically and designed to support an informed choice.
Discover compatible accessories
Find more verified items in Gun Accessories & Care.
Frequently asked questions
Does this item fit every firearm from the brand? It fits compatible STEYR AUG A3 versions with a standard AUG magazine well in .223 Remington / 5.56 × 45 or .300 AAC Blackout. Check the firearm model, magazine well, and caliber marking on the barrel carefully. How can I check the item safely? Fully unload the firearm, open the bolt, and check the chamber. Insert an empty magazine and check that it locks in place and can be removed. Then load it only with ammunition that exactly matches the caliber marking on the mounted barrel. What important technical limitation should I know about? .300 BLK can feed in a .223/5.56 barrel and vice versa, but must never be fired in either. Permanently and clearly mark magazines differently for each caliber. Which variants are included? 10 rounds · .223 Rem. / 5.56 × 45 / .300 BLK. What is the delivery time? If availability is confirmed, delivery takes 1–3 business days; otherwise, 5–10 business days. Is a firearm included? No. Only the accessory described is offered.