According to a quote by Barack Obama, he plans to ban all assault rifles and eventually handguns once he becomes president;
"My first priority will be to reinstate the assault weapons ban as soon as I take office. Within 90 days, we will go back after kitchen table dealers, and work to end the gun show and internet sales loopholes. In the first year, I intend to work with Congress on a national no carry law, 1 gun a month purchase limits, and bans on all semi-automatic guns."
--Barack Obama, VPC Fund Raiser, 2007
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According to John Titor, he belonged to a "shotgun infrantry" where the primary weapons used in battle were/are shotguns;
"My first experience with war came when I joined a shotgun infantry unit at the age of thirteen. In the 4 years I served as a "rebel" - John Titor, circa 2000
"Outright open fighting was common by then and I joined a shotgun infantry unit in 2011. I served with the "Fighting Diamondbacks" for about 4 years." - John Titor, circa 2000
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Perhaps the reason they only had shotguns in Titor's timeline is because the American Federal Empire outlawed assault rifles and handguns and implemented massive house to house gun confiscation raids with Obama's "Domestic Security Forces".
Therefore the people had to fight with what they had left.
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link to www.johntitor.com]