So, my SGL21 came with one of these: http://www.k-var.com/shop/product.php?productid=16986&cat=344&page=1
It works great, but is not chrome lined, going against the Russian mil spec.
The product description states:
"The combination of high grade tool steel and sophisticated heat treating process in vacuum furnaces result in a compensator that maintains its perfectly cylindrical shape, free of any warping, deformation, collapse, or surface contaminants."
I have an issue with the "surface contaminants" claim. Last night, I took out my rifle and gave it the first thorough