The HMD Short Bore Derringer Series comes with the Guardian package that includes a new hammer assembly new main springs new trigger design and new trigger guard. It also includes a steel barrel steel breech block insert steel striker type firing mechanisms positive plunger safety with internal hammer block to help prevent unintended discharge. Barrel length is 2.75a ^2 Overall Length of 4.65a ^2 with an empty weight of 14oz. Cable gun lock replaced with Internal Safety Locking Device (ISLD) Hex key included.