Okay let try to get this right as I am not the sharpest tool in the shed. His blasters have the capability to kill someone, more if they are all in the same area, pretty much instantly and no real way to you know... survive it unless they can some how move fast enough to dodge sound waves. This raises another question how far is too far for it to not kill a person? Moving on to his body it is basically made of recyclable parts that he can interchange? There is no real risk of him being injured now is there? He basically only needs to do a quick patch up and he is good to go. Not to mention you just said he can shatter a considerably dense and durable metal as well as get pretty much be torn apart by a Supervillain like Mammoth and be able to walk away from it. Sorry I'm just concerned as there is no real limitations I can see in him as well as he basically has instant kill switches built into his hands...