Source: http://www.thefirearmblog.com/blog/2013/07/31/apex-esa-enhanced-stabilization-attachment/:
Apex Tactical Specialties will ship a new muzzle brake in August that is designed for competition shooters. Apex claims the Enhanced Stabilization Attachment, or ESA, reduces recoil and muzzle rise to the extent that it “…leaves shooters speechless.” […]