Modular bullpup firearm

1 . A downward ejecting bullpup firearm with a detachable magazine, comprising:

a downward facing ejection port rearward of a magazine well;

a top inspection window positioned substantially in line with the magazine well;

a charging handle body including a rear portion and a forward portion and being movable between forward and rearward positions, the rearward portion blocking the inspection window when the charging handle body is in the forward position and the forward portion including a through-opening that substantially aligns with the inspection window when the charging handle body is in the rearward position.

2 . The firearm of claim 1 , having separable upper and lower receiver bodies.

3 . The firearm of claim 2 , wherein the lower receiver body includes an exchangeable magazine well module, the magazine well module including a housing removably connectable to the lower receiver body that is configured to accept a detachable ammunition magazine and carrying a bolt catch member and a magazine catch member.

4 . The firearm of claim 3 , wherein the bolt catch member and magazine catch member are controlled from a remote position via linkages.

5 . The firearms of claim 4 , wherein the linkages are separable into first and second parts, the first part being part of the magazine well module and the second part being carried by the lower receiver body.

6 . The firearm of claim 5 , wherein the first and second linkage parts are detachably connectable upon insertion and removal of the magazine well module for the lower receiver body.