Military Clears SIG M17 and M18, but P320 Safety Questions Remain
The U.S. military has given the SIG Sauer M17 and M18 a clean bill of health after an unusually extensive review. That is good news for service members carrying the pistols, but it does not settle every safety question surrounding the civilian P320 platform.
According to an August 20 SIG Sauer press release, the Air Force inspected 113,479 M18 pistols and found no condition that could have allowed an “uncommanded discharge.” The military’s Modular Handgun System program office went further, stating that every investigated M17 or M18 discharge involved the trigger being pulled rather than a mechanical malfunction.
The Army’s August 7 statement also pointed to more than 1.5 million rounds fired through over 200 pistols during pre-fielding testing. That included reliability, durability, drop-safety and environmental evaluations.
Those are substantial findings that should not be dismissed because they are favorable to SIG. But neither should SIG be permitted to stretch an inspection of military M18s into a blanket vindication of every P320 configuration.
M17 and M18 Are Not Every P320
The M17 and M18 are based on the P320 fire-control system, but the military pistols include an external thumb safety. Many civilian and law-enforcement P320s do not.
When engaged, the military safety mechanically blocks the trigger bar from engaging the sear. That provides additional protection against an inadvertent trigger press caused by holster interference, clothing, or another object entering the trigger guard. It is a material difference when evaluating reports involving P320s without that safety.
The thumb safety does not directly lock the striker or sear, however. Nor would inspecting military pistols necessarily reproduce every combination of wear, holster pressure, frame movement, aftermarket parts or maintenance found among civilian and police guns.
“The U.S. military analysis further validates the technology, engineering, and performance behind the P320,” said Phil Strader, VP of Consumer Affairs, SIG SAUER. “This was an unprecedented level of inspection, extensive for both the volume of firearms analyzed and for the level of evaluation on each product. Nearly 114,000 firearms were disassembled to methodically examine individual components and reassembled for final functional testing, and the product stood up to the test.”
The military review also does not erase questions about how the Army selected the pistol. AmmoLand previously examined the M17 and M18’s early reliability problems, design changes and abbreviated competition in “How the Army Ditched the Beretta, Snubbed GLOCK, and Bet Big on SIG.”
P320’s History Cannot Be Ignored
SIG launched its voluntary upgrade program in 2017 following drop-fire concerns. The company replaced the trigger and modified the striker, sear and other internal components. AmmoLand covered both the P320 voluntary upgrade and the resulting Hartley class-action settlement.
Later allegations have involved upgraded P320s reportedly discharging during routine handling or while holstered. SIG has won dismissals and defense verdicts, while other plaintiffs have secured substantial jury awards. Those outcomes concern individual cases; they do not prove that every P320 is defective or that every reported discharge resulted from negligence.
A 2024 FBI/DEA Ballistic Research Facility evaluation, obtained from Michigan State Police through a public-records request, was also inconclusive. Investigators could not establish that the examined pistol fired without trigger movement. During specialized testing, however, they found that movement and friction could render the striker safety ineffective if complete sear engagement were also lost. The FBI recommended further examination.
The latest military findings follow the Air Force’s decision to suspend M18 use after Airman Brayden Lovan was killed. Another airman was later arrested on allegations including involuntary manslaughter and obstruction, shifting that case away from the original malfunction speculation.
Real-World Problems
The controversy also creates practical problems. Several ranges I shoot at continue to prohibit the P320 due to safety concerns. Those bans do not prove a defect, but they prevent some owners from reliably practicing or training with a firearm they lawfully purchased.
Gun owners should follow the evidence wherever it leads. SIG SAUER has created a website titled “The Truth About the SIG P320.” The Second Amendment protects our right to keep and bear arms; it does not require blind loyalty to any manufacturer. The military review is powerful evidence supporting the M17 and M18. It is not the final word on every P320.
The P320 and the modular system always appealed to me, especially with companies like Flux Defense really expanding on that concept. I own multiple P320s and P365s. For a long time, it was one of my favorite pistols to shoot. A few months back, I swapped my carry gun from a P365 to a Glock 19 Gen 6 and am not looking back. I was previously shooting a P320 for competition, and have again swapped to a Glock 45 Gen 6.
As a free American, you should carry and shoot what works best for you.
About Duncan Johnson:
Duncan Johnson is a lifelong firearms enthusiast and unwavering defender of the Second Amendment—where “shall not be infringed” means exactly what it says. A graduate of George Mason University, he enjoys competing in local USPSA and multi-gun competitions whenever he’s not covering the latest in gun rights and firearm policy. Duncan is a regular contributor to AmmoLand News and serves as part of the editorial team responsible for AmmoLand’s daily gun-rights reporting and industry coverage.