Shane Tamura, a 27-year-old from Las Vegas, has been identified as the shooter in a tragic incident at 345 Park Avenue, New York City. He allegedly used a Palmetto State Armory AR-15 assault rifle, which retails for about $420. Smears of blood were visible on the assault rifle Shane Tamura used during his deadly rampage at New York City 345 Park Avenue on Monday night, according to a photo obtained by The New York Post. The rifle is a Palmetto State Armory AR-15 assault rifle in 0.223-caliber. According to the report, the gun retails for about $420. At least four, including a New York City police officer, were killed in a mass shooting in the city's Park Avenue Tower in a Midtown Manhattan office building