Unitary sear housing block

1. A firearm comprising:

a frame having at least one interior receptacle defined by opposed interior walls, said interior receptacle having opposed guide rails extending from said opposed interior walls;

a slide mounted on said frame and reciprocably movable relatively thereto;

at least one modular housing disposed in said at least one receptacle and accommodating at least one operational component of said firearm, said at least one modular component comprising a unitary sear housing block accommodating at least one sear mechanism component of said firearm, said modular housing being defined by opposed first and second generally parallel and spaced apart sidewalls, said at least one sear mechanism component of said firearm being located between said first and second sidewalls, said unitary sear housing block including a sear positioning hole configured to receive a pin for pivotally retaining said sear mechanism within said unitary sear housing block between said first and second sidewalls, said sear positioning hole being located so as to properly align a height of said sear mechanism to a striker mechanism of said firearm, said sidewalls being interconnected by at least one lateral cross member and having opposed guide channels formed in said opposed sidewalls, said guide channels being configured to selectively engage said guide rails to facilitate the aligning of said at least one modular housing with respect to said interior receptacle, said at least one modular housing comprising a body portion and slide rails attached to said body portion, said slide rails being configured for facilitating reciprocating movement of said slide, wherein a first one of said slide rails is attached to said first sidewall and a second one of said slide rails is attached to said second sidewall and wherein said body portion and said slide rails are integrally formed together;

wherein said at least one operational component and said modular housing are pre-assembled together as an integrated unit for drop-in insertion into said receptacle during assembly of said firearm.

2. The firearm of claim 1 , wherein:

said guide rails and said guide channels are oriented substantially vertically.

3. The firearm of claim 1 , wherein:

said modular housing includes an ejector bar unitarily formed with modular housing.

4. The firearm of claim 1 , wherein:

said at least one modular housing includes at least one frame locating aperture formed in at least one of said opposed sidewalls, said fame locating aperture being located so as to be aligned with a complimentary aperture in one of said opposed interior walls of said frame when said modular housing is properly positioned within said receptacle; and

wherein said frame locating aperture is configured to receive a pin therein for securing said modular housing to said frame.

5. A firearm comprising:

a frame having at least one interior receptacle defined by opposed interior walls;

a slide mounted on said frame and reciprocably movable relatively thereto;

at least one modular housing disposed in said at least one receptacle and accommodating at least one operational component of said firearm, said at least one modular housing including a body portion, said body portion comprising first and second spaced apart, generally parallel sidewalls interconnected by at least one lateral cross member, said first and second sidewalls defining a longitudinal space therebetween, said space being dimensioned to accommodate a sear mechanism having a pivotal sear, said body portion including a sear positioning hole configured to receive a pin for pivotally retaining said sear mechanism within said longitudinal space between said first and second sidewalls, said sear positioning hole being located so as to properly align a height of said sear mechanism to a striker mechanism of said firearm, slide rails being attached to said body portion, said slide rails being configured for facilitating reciprocating movement of said slide thereon;

wherein said body portion and said slide rails are pre-assembled together as an integrated unit for drop-in insertion into the receptacle during assembly of said firearm.

6. The firearm of claim 5 , wherein:

said interior receptacle includes at least one alignment tab protruding from said opposed interior walls; and

said body portion includes a slot formed in at least one of said first and second sidewalls, said at least one alignment slot being configured to selectively engage said at least one alignment tab of the frame receptacle.

7. The firearm of claim 5 , wherein:

said modular housing includes an ejector unitarily formed with said body portion.

8. The firearm of claim 5 , wherein:

said at least one modular housing includes at least one frame locating aperture formed in at least one of said first and second sidewalls, said fame locating aperture being located so as to be aligned with a complimentary aperture in one of said opposed interior walls of said frame when said modular housing is properly positioned within said receptacle; and

wherein said frame locating aperture is configured to receive a pin therein for securing said modular housing to said frame.