
Availability: In Stock
Current Stock: Out of stock
The Lancer Systems Lancer Magazine 300 Blk 10Rd is purpose-built for shooters running heavy subsonic .300 Blackout ammunition in modern sporting rifles. Unlike standard 5.56 mags pressed into service, this 300 Blackout magazine features optimized internal geometry specifically designed to reliably feed longer, heavier bullets—especially 200-grain and heavier projectiles. If you're shooting subsonic .300 BLK out of an AR-15 platform, magazine reliability matters, and guessing with a converted .223 magazine isn't worth the malfunction risk downrange or at the range.
The translucent smoke body lets you see round count at a glance, and the included flat dark earth floor plate provides quick visual confirmation you've grabbed the right mag for the job. The magazine clearly displays .300 Blackout markings so there's no confusion in your kit. Ten-round capacity makes this a practical choice for hunting, suppressed shooting, or dedicated subsonic training where you want a magazine engineered for the cartridge you're actually running.
Built to Lancer's reputation for durability and function, this magazine delivers the feeding reliability heavy subsonic ammunition demands. Whether you're hunting with a can or running distance drills with subs, a magazine optimized for your cartridge removes one variable from the equation.
| Caliber | .300 Blackout |
| Capacity | 10 Rounds |
| Body Material | Translucent Smoke Polymer |
| Floor Plate | Flat Dark Earth |
| Optimized For | 200gr+ Subsonic Ammunition |
This magazine is specifically designed and optimized for heavy subsonic .300 Blackout ammunition with 200-grain and heavier projectiles. While it's a .300 Blackout magazine, its internal geometry is tuned for subsonic performance, so check with Lancer or your rifle manufacturer if you plan to run supersonic loads exclusively.
Yes. This is a .300 Blackout magazine designed for AR-15 platform rifles chambered in that caliber. Make sure your rifle's magazine well is compatible with standard AR-15 magazines.
The magazine ships with a contrasting flat dark earth floor plate for easy visual identification in your loadout.
The magazine features distinctive .300 Blackout markings and comes with a flat dark earth floor plate that contrasts with the translucent smoke body, making it easy to identify at a glance. Keep them stored separately in your kit to prevent confusion.

SKU: 197555754 • Weight: 0.16oz





Availability: In Stock
Current Stock: Out of stock
The Lancer Systems Lancer Magazine 300 Blk 10Rd is purpose-built for shooters running heavy subsonic .300 Blackout ammunition in modern sporting rifles. Unlike standard 5.56 mags pressed into service, this 300 Blackout magazine features optimized internal geometry specifically designed to reliably feed longer, heavier bullets—especially 200-grain and heavier projectiles. If you're shooting subsonic .300 BLK out of an AR-15 platform, magazine reliability matters, and guessing with a converted .223 magazine isn't worth the malfunction risk downrange or at the range.
The translucent smoke body lets you see round count at a glance, and the included flat dark earth floor plate provides quick visual confirmation you've grabbed the right mag for the job. The magazine clearly displays .300 Blackout markings so there's no confusion in your kit. Ten-round capacity makes this a practical choice for hunting, suppressed shooting, or dedicated subsonic training where you want a magazine engineered for the cartridge you're actually running.
Built to Lancer's reputation for durability and function, this magazine delivers the feeding reliability heavy subsonic ammunition demands. Whether you're hunting with a can or running distance drills with subs, a magazine optimized for your cartridge removes one variable from the equation.
| Caliber | .300 Blackout |
| Capacity | 10 Rounds |
| Body Material | Translucent Smoke Polymer |
| Floor Plate | Flat Dark Earth |
| Optimized For | 200gr+ Subsonic Ammunition |
This magazine is specifically designed and optimized for heavy subsonic .300 Blackout ammunition with 200-grain and heavier projectiles. While it's a .300 Blackout magazine, its internal geometry is tuned for subsonic performance, so check with Lancer or your rifle manufacturer if you plan to run supersonic loads exclusively.
Yes. This is a .300 Blackout magazine designed for AR-15 platform rifles chambered in that caliber. Make sure your rifle's magazine well is compatible with standard AR-15 magazines.
The magazine ships with a contrasting flat dark earth floor plate for easy visual identification in your loadout.
The magazine features distinctive .300 Blackout markings and comes with a flat dark earth floor plate that contrasts with the translucent smoke body, making it easy to identify at a glance. Keep them stored separately in your kit to prevent confusion.
SKU: 197555754 • Weight: 0.16oz
