Not your conventional AR brake, but will tame recoil better than 90% of the tacticool brakes out there. Made from 3/4" 304 stainless. All my long range BR target barrels wear Harrell radial brakes. In the end, I should have spent the $30 to get a radial brake from Harrells. On manual machines, I have several hours in this little thing! Still not finished...waiting on a bottom tap so I can finish tapping the threads so it tightens directly on barrel tenon without the crush washer...