Forward Controls Design Flash Hider 5/8x24 QPQ Black. 6310RF is a closed bottom flash suppressor / muzzle rise compensator that provides 15 to 20percent better compensator performance without the extra muzzle flash concussion and noise normally associated with a compensator. 6310RF's shorter and smaller 3 o'clock and 9 o'clock ports force more gas to be vented through the 3 upward facing ports. 6310RF has .900 x 24 external threads and a taper which are compatible with Plan B Type mounts. Do not use a crush washer if this is going to be a suppressor host. Specifications for Forward Controls Design 6310RF Flash Hider: Manufacturer: Forward Controls Design Color: Black Finish: QPQ Fabric/Material: 17-4PH Stainless Steel Threads per Inch: 5/8x24 Length: 1.725 in Weight: 2.08 oz Package Contents: Forward Controls Design 6310RF Flash Hider Single use packet of Rocksett Forward Controls Design 6310RF: 6310RF Flash Hider 5/8x24 QPQ Black