Smith & Wesson, which designs, manufactures and sells firearms, fell more than 7 percent into the closing bell. Meanwhile, Sturm, Ruger's stock was down more than 4.8 percent.
Background checks from the National Instant Criminal Background Check System rose 2.6 percent in May versus 14.4 percent in April, according to StreetAccount. May background checks were reported 942,970 in May versus 918,710 in the prior year.
The National Instant Criminal Background Check System, or NICS, is a U.S. system that determines if buyers match the name and birth year of a person who is not eligible to own firearms or explosives.
Shares of Sturm, Rugers & Company have gained roughly 8 percent year-to-date. The stock traded near $64 dollars Friday, down from a 52-week high of $78.09.
Smith & Wesson traded near $23 dollars per share. The stock is up more than 3 percent this year, and nearly 50 percent year-over-year.