Patent ID: 8176835

Claim:
A handle assembly and interface system for a semi-automatic firearm of the type having a barrel and a trigger and a forward grip fixed relative to the barrel and adapted to be grasped by a forward hand of a user to support the barrel, said handle assembly and interface system comprising: a shoulder stock adapted to be pressed into the shoulder of a user's rearward hand, a grip portion adapted to be grasped by a user's rearward hand, an interface system adapted for fixed attachment to the firearm, said interface system disposed for reciprocating movement relative to said grip portion and said shoulder stock along a constrained path which in use is generally parallel to the firearm barrel, a finger rest operatively associated with said grip portion and configured to stabilize a user's trigger finger of the rearward hand in a stationary position relative to said grip portion so that in use the firearm trigger moves away from the user's finger when said interface system is moved backward along the constrained path and so that the trigger collides with the stationary finger when said interface system is moved forward along the constrained path, said finger rest and said shoulder stock and said grip portion being fixed together as a rigid unit moveable in use relative to the forward grip, said grip portion and said interface system being arranged without spring force assistance acting therebetween so that in use the user's muscle effort applied through the forward grip moves the interface system longitudinally forward to press the trigger into the user's stationary finger positioned on said finger rest in order to discharge a round of ammunition while said shoulder stock remains pressed against the user's shoulder.