https://www.americanpartisan.org/2020/08/in-praise-of-duplexed-ar-15-magazines/
You will need fast mag changes.
Are you practicing them?
Tempus fugit.
Bracken: In Praise Of Duplexed AR Mags
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Western Rifle Shooters Association
"We need to be very loud and clear now: Fool me once, shame on me, try to fool me twice and it’s your head on a spike." – Sarah Hoyt