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The PMAG 20 AR 300 B GEN M3 isn't just a standard magazine squeezed into a smaller package. Magpul engineered this specifically for .300 Blackout's unique demands. The cartridge comes in all kinds of bullet weights and profiles, which means feeding geometry matters. This magazine uses patented internal geometry designed to handle everything from supersonic rounds to heavy subsonic loads without the reliability compromises you'd get trying to force 300 BLK ammo into a standard 5.56 magazine.
The 20-round capacity gives you a genuinely compact magazine that works great for short-barreled rifles and precision shooting where recoil control and maneuverability matter. It's got the same proven feeding design as Magpul's 30-round 300 BLK PMAG but in a package that won't waste space or add unnecessary bulk to your setup.
The polymer construction is impact and crush resistant, built to survive repeated loading, dropping, and field use without becoming unreliable. You get an easily removable slim floor plate for quick cleanups, aggressive texturing on the front and rear for positive grip, and a paint pen dot matrix so you can mark caliber directly on the magazine itself. The dust and impact cover keeps dirt out when you're not running it in the gun.
The distinct rib design and unique upper texture provide instant visual and tactile feedback that sets this apart from any 5.56 magazine. This prevents dangerous cross-loading situations where the wrong ammunition ends up in the wrong rifle. Made in the USA.
No. This magazine is engineered specifically for .300 Blackout and should only be used with that caliber. The internal geometry is optimized for 300 BLK's bullet profile and weights. Using it for other calibers defeats the reliability improvements that make this magazine worth owning.
Yes. The PMAG 20 AR 300 B Gen M3 is fully compatible with standard AR-15 and AR-10 platform lowers, including M4-style and M16-style receivers. The distinct rib design on the outside makes it visually different from other PMAGs, but it uses the same catch and release mechanism as standard AR magazines.
The 20-round version is noticeably more compact and lighter, which improves maneuverability, especially on short-barreled rifles and SBRs. It's also better for prone shooting and situations where you prioritize a lower profile. Many prefer the balance of the 20-round capacity for training and defensive use without losing meaningful ammunition supply.
Absolutely. The patented internal geometry accommodates the full range of 300 BLK projectile weights and shapes, from light supersonic loads to heavy 200+ grain subsonic ammunition. This is one of the main reasons to use a dedicated 300 BLK magazine instead of adapting a 5.56 design.
| UPC | 840815132233 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MAG1182-BLK |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 20 |
| Color | Black |
| Model | |
| Model Fit | AR-Platform |
| Product Type | Magazine |
| Quantity | 1 |
| Shipping Weight | 0.295 |
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