地面兵装板块9月22日跌0.17%，北方长龙领跌，主力资金净流出3.97亿元

Market Overview - The ground armament sector experienced a slight decline of 0.17% on September 22, with North China Long Dragon leading the drop [1] - The Shanghai Composite Index closed at 3828.58, up 0.22%, while the Shenzhen Component Index closed at 13157.97, up 0.67% [1] Stock Performance - Notable stock performances included: - Optoelectronics Co. (600184) rose by 2.40% to a closing price of 18.34, with a trading volume of 129,500 shares and a turnover of 235 million yuan [1] - ST Emergency (300527) increased by 1.56% to 8.47, with a trading volume of 184,500 shares and a turnover of 155 million yuan [1] - North Navigation (600435) saw a modest increase of 0.56% to 14.30, with a trading volume of 302,200 shares and a turnover of 430 million yuan [1] - Longcheng Military Industry (601606) fell by 0.62% to 46.62, with a significant turnover of 1.797 billion yuan [1] Capital Flow - The ground armament sector saw a net outflow of 397 million yuan from institutional investors and 203 million yuan from retail investors, while individual investors contributed a net inflow of 601 million yuan [2] - Detailed capital flow for specific stocks indicated: - ST Emergency had a net inflow of 18.59 million yuan from institutional investors, but a net outflow from retail investors [3] - North Navigation experienced a net outflow of 17.47 million yuan from institutional investors, with a small net inflow from retail investors [3] - Longcheng Military Industry faced a net outflow of 49.25 million yuan from institutional investors, while retail investors contributed positively [3]