Q&A for Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine

Q

PeeDee, member, from VA, United States, asked on June 01, 2025

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

A

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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Q

Jeff, member, from OH, United States, asked on March 29, 2026

I also want to know if this will work for a Ruger mini 14 300 blackout? Thank you

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Q

Jeff, member, from OH, United States, asked on February 26, 2026

Will these work on a Ruger Mini 14 ?

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Q

ANDREW, member, from IA, United States, asked on October 30, 2024

Do the Gen3 Ranger plates work with these mags?

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Q&A for Magpul Industries PMAG GEN M3 AR-15 .300 Blackout 30 Round Rifle Magazine — 4 Questions & 1 Answers

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

I also want to know if this will work for a Ruger mini 14 300 blackout? Thank you

Will these work on a Ruger Mini 14 ?

Do the Gen3 Ranger plates work with these mags?