Does 300 Blackout Use 5.56 BCG
The 300 Blackout AR15 uses the same 5.56 BCG. No extractor difference either. If you already possess a 5.56 NATO platform and want to shoot the 300 Blackout, you can simply acquire a 300 Blackout barrel without the need for separate bolt carrier groups or charging handles. This makes converting a 5.56 AR15 to 300 Blackout rifle …