grayguns

Next, for our extreme testing, we greatly reduced the case wall support of the P320's 9mm barrel. (Starting at about 1 minute and 45 seconds into the video.) But first, Bruce briefly explains the previous testing where he shot the P320 significantly out-of-battery and then completed more testing without a locking shoulder on the barrel. This will help explain the "blowback design" reference in an earlier video.

After our out-of-battery testing, where we showed a proper P320 cannot fire dangerously out of battery, we cut off the locking shoulder of the barrel and set it up to where it could fire at any point - or at least drop the striker at any point - at which the striker could possibly reach the primer. The pistol was set up similarly to a straight blowback design, where the breach is not locked during primer ignition. P320s don't fire out of battery and blow up; we decided to prove that with our straight blowback P320. Read more about the testing - https://grayguns.com/news/p320-out-of-battery-testing/