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Will this work with 300 blackout barrel? I imagine so, what with the cartridge being dangerously similar to 223/556 caliber... — 3 Answers

by G Rivera, from MT, United States Asked on May 9, 2021

Name Precision Armament EFAB Hybrid Muzzle Brake (4.8)
As Low As $139.99 Save Up to 12%
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Answered by Brandon B, Gear Expert, from IL, United States, on July 28, 2021

Yes this item will be compatible

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Answered by Adam, guest, from MI, United States, on August 07, 2021

It might be very wise to clarify that only the 7.62/.308 version will work with the 300 Blackout. Since it was oddly mentioned of the 'dangerous' similarity to the smaller caliber in your question; the cartridges may be similar but actual bullet size is not. Again ONLY the 7.62/.308 version will safely work with 300 Blackout.

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Answered by Peter, member, from WA, United States, on November 23, 2021

I have an EFAB on my 9” .300 blackout. Muzzle rise isn’t a thing anymore, it’s quiet and tame enough to shoot next to teammates or on the range. People will tell you that 300 aac doesnt make enough pressure to make this brake worth it and they’re not totally wrong but holy heck do I love shooting 110-145 grain supers with this EFAB. Until I get my stamp, my efab stays. Just got an AFAB that im excited to try 5.56 through.

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Last updated 2026-06-28 UTC.