Here's a picture of a muzzle break I cut on the wire edm. [image]
The pop can is for size comparison. Very effective gun does not have recoil pad on it. Wire edming is by no ways economical but I just happen to have one at work. I think it took around 6 to 8 hours burn time. The interior is tapered big at the muzzle to small at the muzzle break end allowing gases to expand somwhat.
The angled "fish gills" are 5 degrees for the first set at the barrel muzzle end, then 10 degrees and finally 15 degrees.
As you may see the left side is a tad bit bigger. The wire broke on the wire edm and it will rethread itself and I wasnt their to watch it. What had happened was one of the slugs pinched the wire and moved the fixture and muzzle break and when it rethreaded it cut a tad bit bigger. I aint to worried about it this rifle has shot 1 inch groups at 300 yards.