Forward Controls Design Flash Hider 1/2x28 QPQ Black. 3P15 is both a precision suppressor mount for Plan B compatible sound suppressors and a superb flash suppressor. The design philosophy regarding suppressor mounts is that in addition to their ability to mount the suppressors for which they're designed they should be good flash suppressors compensators brake etc. in their own right. 3P15 is shorter and smaller in diameter than many suppressor mounts/flash suppressors 3P15's length and diameter are defined by compatibility with Plan B and Atlas adapters. Given these parameters 3P15 flash suppression performance can go head to head with flash suppressors that are longer and larger. 3P15 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. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 3P15 Flash Hider: Manufacturer: Forward Controls Design Color: Black Finish: QPQ Fabric/Material: 17-4 Stainless Steel Threads per Inch: 1/2x28 Length: 2.15 in Weight: 2.4 oz Package Contents: Forward Controls Design 3P15 Flash Hider Single use packet of Rocksett Forward Controls Design 3P15: 3P15 Flash Hider 1/2x28 QPQ Black