An FBI evaluation just went public confirming that a Michigan State Police officer’s SIG Sauer M18 — the same platform as the commercial P320 — fired without the trigger being pulled.
The 32-page report shows that while SIG’s striker-fired system uses multiple safeties, FBI testing found that normal movements by a law enforcement officer can make the striker safety lock useless if the sear fails — letting the striker hit a live round.
The FBI’s Ballistic Research Facility even got the same results with a brand-new M18, showing this isn’t just a one-off fluke. While no single defect was blamed, the possibility of an uncommanded discharge during everyday carry is hard to ignore, especially for a pistol that’s already faced lawsuits and questions over drop safety.
What does this mean for SIG? The FBI isn’t calling SIG negligent — but this report puts fresh heat on the M18/P320’s design and how its safeties work (or don’t) under real-world conditions. Cops, concealed carriers, and armed citizens should watch this closely.
Read the full FBI report here and keep an eye out for SIG’s next move.