The CR-21 was a private effort to create a new rifle for the South African military in the 1990s. Bullpup designs were all the rage at the time (Austria has the AUG, France had the FAMAS, the UK had the SA80, etc), and so a company called Lyttelton Engineering Works (now part of Denel Land Systems) created a bullpup conversion design for the South African R4 (Galil). It was given a very fluid, futuristic look, and equipped with a fiber optic optic without any iron sights. The action and magazines remained original R4/Galil, however
My theory is that the reason most bullpups have bad triggers are that they’re mostly made for militaries with military triggers.
Companies have made decent/good bullpup triggers like the mdrx.