User blog comment:Gundam Legilis/Volume 1 Weapons In Depth- Junior's Batzooka/@comment-15586611-20140719024313

Given that Yang broke it with a punch that sent Junior back across the room, it might be more that Yang can throw some really powerful punches. Honestly, it's hard to judge how durable it was as there are only four other cases so far where someone blocked with their weapon, IIRC:

-Adam blocking the spider-droid's mega-gun, where he seemed to actually absorb the energy of the blast

-Jaune blocking Cardin's mace, where there was no sign of dust or aura being used to enhance the blow

-Sun blocking a shot from Roman, which was likely a much weaker blow (Again, Yang sent Junior across the room in spite of him blocking)

-And Roman blocking almost everything Sun and Blake threw at him, with the same mitigating factor as above

As for the bat mode, I seem to recall deadliest warrior finding that a good blow with a baseball bat shattered a pig's spine in a single hit. Ruby characters might have aura, but that's still a very powerful blow at the end of the day.