CM10 Magazine – 308 Winchester – 20rd

CM10 308 AR10 Magazine: 20-Round Capacity

The CM10 308 AR10 Magazine gives your 308 Winchester CM10 a 20-round magazine option. Its LR/SR pattern makes it the natural companion to the CM10 platform, whether you are setting up a range rifle or keeping a second magazine on hand.

This listing is for the 20-round magazine. If you prefer a lower-capacity option, see the CM10 10-round 308 magazine. The two listings have distinct capacities, so you can choose the configuration that suits your use and location.

Part of District 308

A magazine is one piece of the broader 308 Winchester system. Explore District 308 to see the CM10 rifles, ammunition and other products in this caliber family. The 308 AR10 Magazine belongs with the CM10 rifle listings; CM7S bolt-action rifles use a separate AICS-pattern magazine.

Magazine Details

• Caliber: 308 Winchester
• Capacity: 20 rounds
• Platform: CM10 and compatible LR/SR-pattern magazine wells
• Magazine type: Detachable box magazine

Check your rifle’s magazine requirements and applicable capacity rules before ordering. For background on the LR/SR magazine family, see Magpul’s 20-round LR/SR magazine information.

CM10 308 Winchester Technical Guides

Magazine capacity does not change the ammunition requirements of the firearm. CM’s conventional 308 Winchester firearms can use both 308 Winchester and appropriate 7.62×51 NATO ammunition. Learn how the cartridges are related and why manufacturer guidance still matters in the 308 Winchester vs 7.62 NATO Guide.

Suppressor design can also affect how a CM10 operates. CM generally recommends a flow-through or low-back-pressure suppressor for a supersonic CM10 to limit additional backpressure, receiver gas and operating speed. The specialized CM10 SUBSONIC has different requirements and uses an enclosed suppressor to provide the backpressure necessary for cycling. Read the 308 Suppressor Guide for the complete explanation.

Choose the Correct CM10 Magazine Capacity

Choose this 308 AR10 Magazine when you want a 20-round option for your CM10 308 Winchester setup. Pair it with the rifles, ammunition and technical information featured in District 308 to keep the complete product family connected.