地面兵装板块1月13日跌4.46%，国科军工领跌，主力资金净流出20.35亿元

Market Overview - The ground equipment sector experienced a decline of 4.46% on January 13, with Guoke Military leading the drop [1] - The Shanghai Composite Index closed at 4138.76, down 0.64%, while the Shenzhen Component Index closed at 14169.4, down 1.37% [1] Stock Performance - Notable stock movements included: - Inner Mongolia First Machinery (600967) rose by 4.30% to a closing price of 20.38, with a trading volume of 1.6656 million shares and a turnover of 3.262 billion [1] - Guoke Military (688543) fell by 12.32% to 73.46, with a trading volume of 238,900 shares and a turnover of 1.765 billion [2] - Galaxy Electronics (002519) decreased by 9.15% to 10.42, with a trading volume of 4.8995 million shares and a turnover of 5.350 billion [2] Capital Flow Analysis - The ground equipment sector saw a net outflow of 2.035 billion from institutional investors, while retail investors had a net inflow of 1.778 billion [2] - The capital flow for individual stocks showed: - Inner Mongolia First Machinery had a net inflow of 1.73 billion from institutional investors, but a net outflow of 920.48 million from retail investors [3] - Guoke Military experienced a net outflow of 677.10 million from institutional investors, with a net inflow of 959.03 million from retail investors [3]