243 Winchester Magazine — CM10 10-Round Magpul PMAG
The 243 Winchester Magazine for Chattahoochee Munitions CM10 rifles is a factory Magpul PMAG 10 LR/SR GEN M3 with a 10-round capacity. This double-feed magazine is compatible with CM10 rifles chambered in 243 Winchester, 6mm Creedmoor, and 22 Creedmoor.
Unlike the modified 22-250 Remington magazine offered by Chattahoochee Munitions, this magazine retains its original Magpul factory configuration. No modifications to the follower, magazine body, or internal geometry are required for the specified CM10 platforms.
243 Winchester Magazine Features and Specifications
- Manufacturer: Magpul Industries
- Model: PMAG 10 LR/SR GEN M3
- Manufacturer Part Number: MAG290
- Capacity: 10 rounds
- Magazine Pattern: LR/SR (AR-10 / SR-25)
- Feed Configuration: Double-feed
- Body Material: Impact-resistant polymer
- Follower: Self-lubricating anti-tilt follower
- Spring: Stainless steel
- Floorplate: Removable for cleaning and maintenance
- Configuration: Factory original, unmodified
- Finish: Black
CM10 Magazine Compatibility — Three Chamberings
Although listed as a 243 Winchester Magazine, this Magpul PMAG also serves two additional CM10 chamberings within the Predator Plains collection.
243 Winchester — 20-Inch CM10
The 243 Winchester CM10 uses this factory Magpul 10-round LR/SR magazine. Its compact magazine body provides a shorter profile than higher-capacity magazines, which can be useful during field carry and supported shooting.
6mm Creedmoor — 18-Inch CM10
The 18-inch 6mm Creedmoor CM10 uses the same magazine configuration, maintaining common magazine compatibility across the specified CM10 platforms.
22 Creedmoor — 22-Inch CM10
The 22-inch 22 Creedmoor CM10 also uses this factory Magpul PMAG. The magazine requires no CM-specific modification for this configuration.
243 Winchester Magazine vs. 22-250 Magazine
Although all four Predator Plains chamberings are offered in the CM10 semi-automatic platform, they do not share identical magazine requirements.
The CM10 chambered in 22-250 Remington uses a separate magazine individually modified by Chattahoochee Munitions to accommodate the shorter cartridge overall length. This includes changes to the internal magazine geometry.
For that application, see the dedicated 22-250 Magazine.
This 243 Winchester Magazine is intended for the specified CM10 243 Winchester, 6mm Creedmoor, and 22 Creedmoor platforms and should not be substituted for the CM-modified 22-250 magazine.
Explore Predator Plains — High Velocity Systems
The Predator Plains collection brings together the Chattahoochee Munitions CM10 high-velocity rifle families chambered in 22 Creedmoor, 6mm Creedmoor, 22-250 Remington, and 243 Winchester.
Each cartridge family has its own characteristics and magazine requirements. Predator Plains provides a central destination for exploring these CM10 rifle configurations and their supporting components.
Magpul PMAG 10 LR/SR GEN M3 Manufacturer Information
Magpul manufactures the PMAG 10 LR/SR GEN M3 as a compact, durable polymer magazine with an anti-tilt follower, stainless steel spring, and removable floorplate.
For original factory specifications and manufacturer compatibility information, visit the Magpul PMAG 10 LR/SR GEN M3 product page.
Compatibility Notice: The additional cartridge compatibility described here applies specifically to the Chattahoochee Munitions CM10 configurations listed above. It does not establish universal compatibility with other AR-10 or LR/SR-pattern firearms.
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