US Patent 10126082 Sear mechanism for firearms

A rotational sear block isolates the rotational movement of the sear to the sear mechanism without using a rotational trigger. The isolation of the sear rotation to the sear mechanism allows for a single axis translational trigger to be used which gives the shooter the advantages of a short, crisp trigger pull without any off-axis movement. Additionally, the positive sear engagement and inherent safety of the design are achieved due to the sear being engaged and biased onto the sear block surface, disallowing unintended or accidental release.