Forward Controls Design Flash Hider 5/8x24 Nitride Black. Threaded for 5/8 x 24 (internal) and M22 x 1 (external) 6310AE is compatible with Allen Engineering 30 sound suppressors such as AEM5-30 and AEM5-30K. 6310AE is a 6310 (introduced in 2017) that's been designed to accept Allen Engineering 30 cal sound suppressors. 6310 itself is based on the TDP A2 compensator and features smaller 3 and 9 o'clock ports which force more gas to be vented through the top 3 ports. Throughout the years we've added small improvements to it the most notable is the internal grooves that help keep the flash inside the cone cavity instead of outside of the muzzle device. Flats are incorporated for standard AR15/M16 armorer's wrench or 3/4in wrench for installation. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 6310AE Flash Hider: Manufacturer: Forward Controls Design Color: Black Finish: Nitride Fabric/Material: 4140 Steel Threads per Inch: 5/8x24 Length: 1.88 in Weight: 1.96 oz Package Contents: Forward Controls Design 6310AE Flash Hider Single use packet of Rocksett Forward Controls Design 6310AE: 6310AE Flash Hider 5/8x24 Nitride Black