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If your 300 BO is for firing supersonic and your lower uses a standard buffer you should be ok. If running suppressed fire components such as buffer may need adjustment. Be sure to dedicate a BCG for each separate upper.
im noticing they even make 300 blackout barrels now for HK93/HK33 rifles, as well as theyve been making them for AKs for a while.. just a barrel change on any rifle
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