^^Not to be a "D-bag" - But heat shields, unless used for their intended purpose, are just for "cool looks" and added weight - they are meant to shield someone from a hot barrel when doing a thrust with a bayonet -
I had one on my M500 for a couple years, and took it off - I wanted to be able to just wipe down the barrel when cleaning -
Also another factor you don't notice is weight, I felt a difference right away when it was removed - and with the heavy wall barrel on the Shockwave, its meant to be a small and compact weapon, adding more weight, no bueno, in my opinion.
But yes, they do look cool...