as Sharp said, I've found that you can conceal almost anything on a MercHarness rig under your arm. I cc'd a CRKT hissatsu all day once, so problems. Then I found out that was illegal in my area, so... haven't done that again since. But seriously, you could cc a battle ax like that, because of the shape of the human body and also because that's an area where there is usually a lot of extra space in clothing.