各位好，请教一下
在中央社英语新闻看到这则内容
http://focustaiwan.tw/news/asoc/201804030002.aspx
Taiwanese teen threatening school in U.S. had handmade gun, ammo
Thornton, Pennsylvania, April 2 (CNA) A Taiwanese student who was arrested in
the United States last week for threatening to shoot up his school had built
a 9mm handgun with parts bought online and had over 1,600 rounds of
ammunition for various firearms, U.S. media reported Monday.
An Tso Sun (孙安佐), 18, had approximately 225 rounds of 12-gauge ammo, 663
rounds of 9mm ammunition, 295 rounds of AR-15 ammunition, and 425 rounds of
AK-47 ammo, cbsphilly.com said, citing Michael Chitwood, superintendent of
the Upper Darby police in Pennsylvania.