A Handgun from the Titanfall (Series) games with an auto-lock feature. The version in Titanfall 1 is the Mk5 and is available as a pilot primary weapon, while the version in Titanfall 2 is the Mk6 and is only available as a boost.
The Mk6 returns in Apex Legends, where it is exclusively used by Ballistic (Apex Legends) for his tactical ability.