Lower receiver for firearms

Abstract

A lower receiver for a firearm is disclosed that includes a trigger and hammer assemblies receiving section and a magazine well section, a raised bolt catch mount and a trigger access opening defined between the sections. The bolt catch mount includes an opening for insertion of a bolt catch mounting pin, a pin insertion relief formed at the magazine well section aligned with bolt catch mount opening. A trigger finger guide feature is defined between the trigger access opening and the magazine well section below the bolt catch mount.

1 . Firearm features comprising:
 a trigger with a width, a user interface receiver at one side of said trigger and a forward portion structure opposite said trigger from said user interface, said forward portion structure having a width greater than said width of said trigger; and   a trigger finger guide feature comprising a first detent surface defined in said forward portion structure at a position adjacent to said trigger, said first detent surface having a maximum depth into said forward portion structure relative to said forward portion structure width selected so that said first detent surface is raised relative to said trigger width.   
     
     
         2 . The firearm features of  claim 1  wherein said first detent surface has an overall width and an overall length extending away from the trigger, said maximum depth, said overall width and said overall length of said first detent surface configured to rest a trigger finger therein. 
     
     
         3 . The firearm features of  claim 2  wherein said first detent surface maximum depth is between about 7.6 mm and 10.15 mm, said overall width is between about 27.90 mm and 33.0 mm, and said overall length is between about 17.75 mm and 20.35 mm. 
     
     
         4 . The firearm features of  claim 2  further including a trigger guard connected at said forward portion structure and with a width greater than said trigger width but less than said forward portion structure width, said trigger finger guide feature further characterized by said first detent surface overall width extending to a position adjacent to said trigger guard. 
     
     
         5 . The firearm features of  claim 4  wherein said first detent surface maximum depth is no greater than one half the difference between said trigger guard width and said forward portion structure. width. 
     
     
         6 . The firearm features of  claim 1  further comprising a second detent surface on an opposite side of the firearm and directly opposite said first detent surface, said second detent surface having a maximum depth into said forward portion structure relative to said forward portion structure width selected so that all of said second detent surface is raised relative to said trigger width. 
     
     
         7 . The firearm features of  claim 1  wherein said first detent surface includes an arcuate leading edge spaced from said trigger. 
     
     
         8 . The firearm features of  claim 1  further comprising a lower receiver having said forward portion structure and said user interface receiver thereat and including a trigger and hammer assemblies receiving structure adjacent to said user interface receiver and a magazine well and bolt catch structure at said forward portion structure and adjacent to said trigger and hammer assemblies receiving structure, said magazine and bolt catch structure comprising:
 opposite side walls defining a magazine well section having a magazine receiving opening at one end thereof; and 
 a bolt catch mount at one of said side walls adjacent to said magazine well section, said 
 trigger finger guide feature formed in one of said side walls below said bolt catch mount and adjacent to said magazine well 
 
     
     
         9 . The firearm features of  claim 8  further comprising an opposite finger guide feature at another of said side walls and opposite said trigger finger guide feature. 
     
     
         10 . The firearm features of  claim 8  wherein said maximum depth of said a detent surface into said one of said side walls is selected so that all of said detent surface is no deeper than a surface of the trigger and hammer assemblies receiving structure adjacent to said one of said side walls of said magazine well section. 
     
     
         11 . The firearm features of  claim 8  wherein said bolt catch mount includes an opening parallel to said one of said side walls for insertion of a bolt catch mounting pin, said improved magazine well and bolt catch structure further comprising an access relief at said one of said side walls adjacent to said bolt catch mount at said magazine well section and aligned with said bolt catch mount opening for accommodating bolt catch mounting pin insertion into or withdrawal from said opening at said bolt catch mount. 
     
     
         12 . The firearm features of  claim 11  wherein said access relief is an elongated relief. 
     
     
         13 . The firearm features of  claim 11  wherein said bolt catch mount opening includes first and second aligned passageways. 
     
     
         14 . The firearm features of  claim 13  wherein said access relief is spaced from said aligned passageways of said bolt catch mount opening. 
     
     
         15 . The firearm features of  claim 8  wherein trigger and hammer assemblies receiving structure and said magazine well and bolt catch structure, said firearm features further comprising:
 a raised bolt catch mount defined at said magazine well and bolt catch structure between said trigger and hammer assemblies receiving structure and a magazine well section of said magazine well and bolt catch structure, said bolt catch mount including an opening for insertion of a bolt catch mounting pin, said trigger finger guide feature defined between said trigger access opening and said magazine well section below said bolt catch mount; 
 a pin manipulation access relief at said magazine well section and aligned with said opening at said raised bolt catch mount; and 
 said user interface receiver including a buffer tube receiver adjacent to one end of said trigger and hammer assemblies receiving structure. 
 
     
     
         16 . The firearm features of  claim 15  further comprising a pistol grip interface at said user interface receiver below said trigger and hammer assemblies receiving structure, a selector assembly receiver at said trigger and hammer assemblies receiving structure, and a pivot pin receiver and a magazine catch assembly receiver at said magazine well section, and wherein said pin manipulation access relief is located above said magazine catch assembly receiver at said magazine well section. 
     
     
         17 . The firearm features of  claim 15  wherein said maximum depth of said detent surface of said trigger finger guide feature is selected so that all of said detent surface is no deeper than a surface of said trigger and hammer assemblies receiving structure adjacent to said trigger access opening thereat. 
     
     
         18 . The firearm features of claim of  17  wherein said detent surface has an overall width and an overall length extending away from said trigger access opening. 
     
     
         19 . The firearm features of claim of  15  further comprising another detent surface on an opposite side of said lower receiver between said trigger access opening and said magazine well section. 
     
     
         20 . The firearm features of claim of  15  wherein said access relief is an elongated relief, wherein said bolt catch mount opening includes first and second aligned passageways, and wherein said access relief is spaced from said aligned passageways.