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In the process of building a 12.5" with suppressor. I guess my question is will an adjustable gas block be necessary for subsonic suppressed and unsuppressed? Thanks for any info.
 

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If 300 BO, no. If 6.8mm, yes but unless you have a special barrel you will probably not be shooting subsonic. I've only shot supersonic suppressed with my 6.8 and AGB was essential.
 
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