The ported comp looks like this...it does a great job of making the 500 even LOUDER...and it can throw lots of nice crude into your face...you have to carry a pocket knife and mirror to dig the scraps out of your face from to time

They come with 2 factory comps and the one pictured here seals the 6 top holes along the sight to help with the scope damage...they are marketed as one for jacketed and one for cast.

I had a machinist make me a solid one up. Much nicer without the hot pillow to the face.