300 BO optimal barrel length

[adam_p]

8-9” barrel is the sweet spot for the Blackout. Make sure it has a pistol length gas system.


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This.

I went 10" because I wanted more handguard and didn't want a bigger handguard that would fit over my suppressor.

[savin yours]

If you start off with a pistol, can you file a form 1 and make it into a SBR?

Yes


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