Focusing on absolute recoil mitigation  and muzzle control for long range engagements, The SIGIL (Self Indexing  Gill Brake) has taken the proven technology and port geometry used in our 3 port Gill brake and put them in a package that you can install at  home! This new brake design allows for the simple and easy install or  removal of the brake as desired.
These brakes and lock nuts are made of  416 stainless steel and have a salt bath nitride finish for a deep black colour that is impervious to wear and corrosion.
Available in  6.5mm, .308 cal and .338 cal.
We are offering 3 designs of lock nut to cater to several cosmetic preferences.
Specs.
Thread pitch: 5/8 X 24 TPI
Diameter: 1.050″
Length (including lock nut): 2.725″
Weight (including lock nut): 4.9 oz – 5.2 oz
Marcus Funk –
I purchased a rifle with a sigil brake installed from ATRS. The quality is evidently premium. The orientation of the ports or gills prevent muzzle jump as their directed up and to the side. No straight sideways like alot of breaks. Very happy and looking to have another installed on a 300wm