Sturm, Ruger & Co. Inc. /zigman2/quotes/200036418/composite RGR -0.87% shares fell 8.4% in the extended session Wednesday after the company reported declining year-over-year sales for the second quarter. The gun maker reported second-quarter net income of $6.2 million, or 35 cents a share, compared with $15.2 million, or 86 cents a share, in the year-ago period. Revenue fell to $96.3 million from $128.4 million in the year-ago period. According to FactSet, no analysts cover the company. Sturm Ruger stock has gained 6% this year, with the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.18% rising 20.2%.