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The Bushmaster M4 Types Carbine, a semiautomatic rifle, uses a 20 or 30-round magazine.
CNN: Gun control: It's on all of us
The suspect also bought an AR-15 semiautomatic rifle, a military-style gun popular with sportsmen.
WSJ: Suspect's Rapid Descent
Police recovered two handguns and 15 rifles at Grumberg's Saugerties residence including an AR-15 semiautomatic rifle after executing a search warrant.
WSJ: Upstate NY man arrested on gun charges
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