a bullpup assembly for converting an ar - 15 type firearm having an ar - 15 stock in unmodified assembly into a bullpup configuration . the bullpup assembly includes a frame body coupleable with the body of the firearm , the frame comprising a bullpup trigger , and the frame being configured to replace the ar - 15 stock , and a trigger link coupled with the bullpup trigger and coupleable with a firearm trigger of the firearm , wherein actuation of the bullpup trigger actuates the firearm trigger via the trigger link .