Investors on Friday pushed the shares of gunmakers higher in what has become a typical reaction following a mass shooting.

On the day after five police officers in Dallas were killed by a sniper, Smith & Wesson shares gained 2.8 percent, to close at $29.07.

The company’s shares opened trading at an all-time high.

Rival Sturm, Ruger & Co. saw its shares gain 4.9 percent, to $67.66.

In addition, shares of Taser International, the maker of stun guns and body cameras used by police departments across the country, spiked 5.9 percent, to $27.30.

Digital Ally, a much smaller maker of body cameras, saw its shares soar 62 percent, to $6.69.

The rash of mass shootings and police-related incidents have made gun and body-camera stocks among the market’s best performers this year.

Smith & Wesson, while not in the S&P 500, would, with its 28.7 percent rise this year, rank as the 41st best performer among the index’s stocks, a spokesman for S&P Dow Jones Indices told The Post.

Sturm, Ruger would rank No. 221, with a year-to-date return of 9.5 percent.

Taser shares have gained 58 percent in 2016, while Digital Ally is up 5.9 percent this year.

The S&P is up 4.1 percent this year as of Friday’s close.

The soaring stock prices are caused by a spike in gun purchases — which are driven, analysts have said, by a fear that Congress will enact tougher gun control measures in response to shootings.

A similar surge in gunmaker shares was seen after the June mass shooting in Orlando, Fla.

Since the Orlando tragedy, gun sales have spiked 40 percent, according to FBI background checks.