Testing done on a Sig Sauer P320 by Omaha Outdoors indicates that there is a reproducible issue with the firearm in which it can fire when dropped.
Omaha Outdoors sells firearms and shooting accessories, so it is in their best interest financially to keep selling the P320. Instead, the company has announced that they will stop selling the firearm until the safety issue is addressed.
The testing was done on a P320 TACOPS 9mm, a P320 X-Five 9mm and two P320 Compacts in 45 AC loaded with factory ammunition with the bullets pulled out.
The gun initially passed the California DOJ drop test standards which involve dropping the gun parallel to or perpendicular to the ground.
They then tested dropping the gun with the muzzle facing up, and discovered if the slide and frame both hit the ground together, the gun would discharge.
Omaha Outdoors reports that this was reproducible from below 3 feet off of the ground, and in both calibers used.
Only one of the pistols tested did not discharge, and that pistol had a lighter trigger than the others.
Omaha Outdoors suggests that the weight of the triggers is causing the trigger to depress when dropped. When they cut the weight of the trigger on the guns which were discharging, it eliminated the drop fire issue.
They said that when they contacted Sig Sauer about the issue, the company responded that it was the first that they had heard of this issue.
The test suggests that anybody who currently has a P320 is likely to have this issue unless the trigger can be replaced with a lighter weight trigger.
You can see the full video of the testing below: