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I'm no ballistics expert, but I believe 5.56 was designed arround an 18 inch barrel and the powder burns all the way to the end. That is why the shortie is so much louder and brighter when fired compared to longer barrels. The 300 blackout was designed around an 9 in barrel so all the propellant is burned up within the first 9 in.
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If ever time should come, when vain and aspiring men shall possess the highest seats in Government, our country will stand in need of its experienced patriots to prevent its ruin.
Samuel Adams
It is the duty of the patriot to protect his country from its government.
Thomas Paine
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