Patent ID: 7472507

Claim:
A firearm comprising: a frame having at least one interior receptacle defined by opposed interior walls, said interior receptacle having a main cavity having a first width and a guide cavity having a second width, said first width and said second width being of different dimension; at least one modular housing disposed in said at least one receptacle and accommodating at least one operational component of the firearm; wherein the at least one modular housing comprises a body portion and a set of slide rails attached to the body portion, said slide rails being configured for reciprocating movement of a slide portion of the firearm thereon; an engagement means extending outwardly from said at least one modular housing, said engagement means being configured to selectively engage with said guide cavity to facilitate the aligning of said at least one modular housing with respect to said interior receptacle; and wherein the at least one operational component and the modular housing, including the body portion and set of slide rails, are pre-assembled together as an integrated unit for drop-in insertion into the receptacle during assembly of the firearm.