Answers for Will this fit properly/securely in a 556 lower receiver?

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Magpul Industries + Magazines Magpul Industries Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver Magpul Industries + Magazines Magpul Industries Magazines + Rifle Magazines Magpul Industries Rifle Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver Magpul Industries + Magazines Magpul Industries Magazines + Rifle Magazines Magpul Industries Rifle Magazines + AR Rifle Magazines Magpul Industries AR Rifle Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver

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Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine

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Answered by JohnL, member, from TX, United States, on July 31, 2025

Yes this will fit into a 556/223 lower receiver since they share the same lower as 300 blackout. You might run into feeding issues using this mag in a 556/223. The guiding tabs on the inside of the mag are a litle different.

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Magpul Industries + Magazines Magpul Industries Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver Magpul Industries + Magazines Magpul Industries Magazines + Rifle Magazines Magpul Industries Rifle Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver Magpul Industries + Magazines Magpul Industries Magazines + Rifle Magazines Magpul Industries Rifle Magazines + AR Rifle Magazines Magpul Industries AR Rifle Magazines Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine Q&A Question - Will this fit properly/securely in a 556 lower receiver

Last updated 2025-11-12 UTC.