Surefire and AAC make brakes that work with our 3/4-24 thread on the EMC, as well we will be releasing the 762MAMS brake shortly.
The EMR is not chrome lined, so if you wanted to you could chop it to 16" and re-thread -- you should not need to open the gas port. But the biggest issue is very very few people have the tools to work on SR-25's, and I've seen more than 1 gun buggered up by an otherwise competant AR builder who thought they knew more about SR's than they did.
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