The Pentagon is defending the safety of M17 and M18 handguns — military versions of the controversial SIG Sauer P320 — saying that “there has never been a mechanically caused accidental discharge” involving the service weapon.

The Aug. 7 statement followed a review of the Modular Handgun System, a program led by the Army’s Project Manager Soldier Lethality, initiated after an airman was shot and killed because of an alleged “uncommanded discharge” with an M18 handgun.

Last year’s incident resulted in an immediate inspection of all M18 handguns issued by the Air Force Global Strike Command as well as a temporary pause of their use, which was lifted a month later.

Additionally, three airmen involved in the deadly shooting were charged with lying to investigators. They claimed the gun just “went off” when the shooter slammed his duty belt against a desk, when in reality, he had pointed it at the victim in a “joking manner.”

According to the statement, the Army has investigated all reports of incidents involving MHS pistols discharging without a trigger pull, and firearms mishaps account for less than 0.006% of all MHS pistols issued.

“All investigated incidents of alleged ‘uncommanded discharges’ have been traced back to the trigger being pulled,” Army officials say, adding that they blame “public speculation and online misinformation” for the safety concerns regarding the handgun design.

However, the civilian version of the handgun has been linked to dozens of injuries and a handful of deaths, with victims claiming the gun discharged a round without a trigger pull. In turn, the design has been the subject of more than 100 legal challenges since it was introduced in 2014, with varying outcomes.

In many of the lawsuits, attorneys argue that the design’s passive safeties can fail to adequately prevent unintentional manipulation of the trigger. It’s important to note that unlike the civilian P320, the M18 and M17 pistol designs are equipped with a manual safety.

Since the SIG design won DoD approval in 2017, M17 and M18 pistols have become the standard-issue sidearm for the Army, Air Force, Marine Corps, and Navy. There are more than 400,000 currently in service.