1215RF a Plan B compatible brake / sound suppressor mount, a collaboration is  between Revival Defense and Forward Controls Design, threaded for 1/2 x 28.

Based on the successful 1215KM design that's been well proven on many of their Dead Air Keymo and Xeno devices, 1215RF is a single chamber brake compatible with Plan B sound suppressors, and Rearden Atlas adapters.

1215RF has external 0.900 x 24 threads, compatible with sound suppressors with 0.900 x 24 threads (such as CGS and Plan B) and adapters such as Rearden's Atlas adapter.

1215RF has .900 x 24 External threads & a taper that are compatible with Plan B Type Mounts such as REARDEN Mounts and Various Suppressors. They worked with various Suppressor companies such as CGS in order to ensure compatibility with their devices when using a Rearden ATLAS.

Specifications:

• Length: 1.725"
• Weight: 2.17 oz.
• Internal threads: 1/2 x 28
• External threads: 0.900 x 24 
• Wrench flats: 3/4"

Please NOTE:

• 1215RF has wrench flats for torquing it on the barrel.  Do not use a screwdriver and insert it into one of its ports to torque it.  With 30ft lbs of torque, using a rod or screw driver will cause damage to the muzzle device.
• Screw driver not included (but seriously, use a 3/4 wrench, armorer's wrench, or JMW, not a screw driver.)