Those "casting" marks will come out real easy with the first muzzle blast [img]/ubbthreads/images/graemlins/grin.gif[/img] What you are seeing is the very fine particles of dust from being carried in my pocket [img]/ubbthreads/images/graemlins/grin.gif[/img] This brake is 100% machined out of SOLID 416 stainless rod.
To get an idea of the proportion of the muzzle brake
in the picture hold your rifle barrel up to the screen (but make sure it's not loaded) [img]/ubbthreads/images/graemlins/grin.gif[/img] on my 21" monitor the brake in the picture is about 100 times larger than in real life. I took the pictures on macro mode at 8mg and so you can see everything. I guess I should have blown out the ports before I took the pictures but I didn't notice them until I saw the LARGE pictures on the post.
Life's to short to be too serious [img]/ubbthreads/images/graemlins/wink.gif[/img]...have a good day