This is the KFM flash hider that ships as part of EOTech's DCBL 5.56 suppressor system — it's the muzzle device that the suppressor mounts onto/over. It measures 7.9 inches with the hub/flash hider installed versus 7.1 inches for the suppressor body alone, and weighs 19.6 ounces with the hub/flash hider, against 13.7oz for the suppressor and hub alone, meaning the flash hider plus hub assembly accounts for roughly 0.8 inches of length and about 5.9 ounces of weight — but that's the combined hub+flash hider figure, not the flash hider alone, so I don't have an isolated spec for just the standalone flash hider component (part 9-EOT-DCLB-KFM-556). EOTech 5.56mm Suppressor Ready Flash Hider 9-EOT-DCLB-KFM-556