This is the muzzle device you’re looking for if you want a 13.7″ barrel to just a hair over 16″. Dead Air Keymo compatibility.

Two Chamber Brake

Neutral Configured NOX

3 Ports at 9, 12 and 3 O’Clock

Great for Left and Right Handed Shooters

Allows you to take your 13.7″ barrel p/w to make it 16″ OAL