The parts — sights, stocks, muzzles, buffer kits and grips — arrived in three shipments and had a combined value of more than $378,000... The parts arrived over a period of three months and were bound for a legitimate US-based gun parts seller and distributor... The United States restricts imports from countries with which it has an arms embargo, including China. The US imposed an arms embargo after the deadly 1989 crackdown on pro-democracy protesters in Tiananmen Square. The CBP didn’t say to whom the parts were being shipped, who shipped them, and whether anyone would be charged in connection...