Firearm safety mechanisms, visual safety indicators, and related techniques

A computerized method for controlling the operation of a firearm, comprising:

• using at least one processor to perform:
• receiving data from one or more buttons disposed at least partially within a surface of a handle of the firearm, wherein the data is indicative of an input code provided by a series of presses of the one or more buttons by an operator over an input time period;
• determining whether the input code matches a stored code;
• and
• upon determining the input code matches the stored code, transmitting a signal to a safety mechanism comprising:
• a trigger bar stop comprising a corner;
• and
• a cylindrical cam comprising a recess, the cylindrical cam configured to move the trigger bar stop between a first position and a second position, wherein:
• the signal causes the cylindrical cam to rotate to cause the safety mechanism to change from (a) the first position, in which the corner of the trigger bar stop fits within the recess of the cylindrical cam such that the trigger bar stop blocks actuation of a trigger to fire the firearm to (b) the second position, in which the corner of the trigger bar stop is outside of the cylindrical cam such that the trigger bar stop does not block actuation of the trigger, so that the firearm can be fired by the operator.

At least one non-transitory computer-readable storage medium storing processor-executable instructions that, when executed by at least one processor, cause the at least one processor to perform:

• receiving data from one or more buttons disposed at least partially within a surface of a handle of a firearm, wherein the data is indicative of an input code provided by a series of presses of the one or more buttons by an operator over an input time period;
• determining whether the input code matches a stored code;
• and
• upon determining the input code matches the stored code, transmitting a signal to a safety mechanism comprising:
• a trigger bar stop comprising a corner;
• and
• a cylindrical cam comprising a recess, the cylindrical cam configured to move the trigger bar stop between a first position and a second position, wherein:
• the signal causes the cylindrical cam to rotate to cause the safety mechanism to change from (a) the first position, in which the corner of the trigger bar stop fits within the recess of the cylindrical cam such that the trigger bar stop blocks actuation of a trigger to fire the firearm to (b) the second position, in which the corner of the trigger bar stop is outside of the cylindrical cam such that the trigger bar stop does not block actuation of the trigger, so that the firearm can be fired by the operator.