Hello and welcome to the mod.
This is intentional. Let me recall the original creator's reasoning behind it.
The CrossBowMag is one of the deadliest weapons available. What is lacks in stealth capability it more than makes up for in full on combat.
The creator opted to remove the ability to shoot through bars based on feedback. Some players were spamming high explosive rounds within the confines of public bases in restricted areas and some Server Admin found it to be a little over powered and upset the balance. Such players were able to find a place by themselves on their own, and while they could still annoy players by taking the bulk of kills, it was a compromise.
I just tested the CrossBowMag with the ability to shoot through bars restored.
I could wipe out an army on Zombie Bears using steel bolts, almost quicker than the time it takes to reload the new pipe shotgun.
View attachment 22416
This has always been a subjective point of contention and it will remain as it is for the above reason.
However, there is nothing stopping you from being able to make your own choice on this based on your own set up.
Here are instructions on how to add the ability to shoot through those bars.
1. Open your items.xml file with the mod.
2. Search for CrossBowMag.
3. Insert <property name="Hitmask_override" value="Arrow"/> below <property name="Class" value="Launcher" /> in that section for the CrossBowMag.
4. Load your game and test the result. It should appear to play as the above image; a handheld weapon of absolute destruction.
If it works out, great. And if not, you can always remove that line of code to restore it to match the creator's compromise.
For the next update, I shall add that line of code but have it commented out <!--property name="Hitmask_override" value="Arrow"/--> which will stop it being read but allow it to be reactivated again based on personal preferences.