A Fully enclosed trigger guard for the Caliburn.
I was not happy with how the original was open at the front; it tended to wiggle,
and it didn't give me a good place to 'rest' my index finger when just holding the blaster but not intending to fire. -keep your finger Outside the trigger guard until engaging, safety practices.
The front end of this guard is attached by hooking over the existing mount for the magazine release spring; so it should just drop into your Caliburn without needing to modify any other parts (assuming you have the latest gen Caliburn with the bolted-in guard, not pinned)