Sturm Ruger & Co. /zigman2/quotes/200036418/composite RGR +2.70% had its best sales year since 2016 as a "historic surge" in firearms demand held throughout 2020. Shares of the firearm maker rose nearly 3% in the extended session Wednesday. Sturm Ruger said it earned $31.7 million, or $1.78 a share, in the fourth quarter, compared with 46 cents a share in the year-ago period. Sales rose to $169.3 million, from $105.1 million a year ago, and were the company's highest quarterly sales since the first quarter of 2017. Sales for the year reached $568.9 million, the highest yearly sales since 2016. "Our tremendous sales growth and profitability in 2020 was driven by the historic surge in consumer demand that began late in the first quarter and continued throughout the year," Chief Executive Christopher J. Killoy said in a statement. Shares of Sturm Ruger ended the regular trading day down 1.1%.