Handle for a semi-automatic firearm

A handle assembly for a semi-automatic firearm having a trigger, said assembly comprising:

• a pistol grip adapted to be grasped by the user's hand,
• a finger rest extending forwardly from said pistol grip and configured to stabilize the end of a user's trigger finger stretched in front of a trigger of the firearm while the remaining fingers of the user's hand grasp said pistol grip,
• said pistol grip and said finger rest fixed together as a moveable unit,
• and a lock selectively moveable between unlocked and locked conditions for respectively permitting or preventing reciprocating movement of said pistol grip and said finger rest relative to the firearm trigger;
• wherein said lock includes a retractable pin and a rotary cam fixed relative to said retractable pin such that rotation of said cam causes a corresponding axial displacement of said pin.

A handle assembly for a semi-automatic firearm having a trigger, said assembly comprising:

• a shoulder stock having a rearwardly facing butt end adapted to be pressed into the rearward shoulder of a user,
• a cavity extending forwardly through at least a portion of said shoulder stock, said cavity having front mouth opening, said cavity having a generally continuous cross-sectional inner profile extending rearwardly from said mouth opening toward said butt end of said shoulder stock,
• a grip adapted to be grasped by the user's rearward hand,
• a finger rest extending forwardly of said grip and configured to stabilize the end of a user's trigger finger stretched across a trigger of the firearm while the remaining fingers of the user's rearward hand grasp said grip,
• said shoulder stock and said grip and said finger rest fixed together as a moveable unit,
• and a lock selectively moveable between unlocked and locked conditions for respectively permitting or preventing reciprocating movement of said shoulder stock and said grip and said finger rest relative to the firearm trigger;
• wherein said lock includes a retractable pin, and wherein said lock includes a cam acting between said retractable pin and said shoulder stock.