I wanted to see if the item below would be ok to bring. It is parade rifle so it's a replica that doesn't shoot anything. From the pictures though I'll spray paint the tip orange to meet the Fed. Guidelines.
I noticed in a different Question someone ask about a prop gun and it was responded with it "either be translucent enough to see inside, or be at least half covered with solid white or bright red, orange, yellow, green, blue, pink, or purple."
The FAQ here: http://www.anime-expo.org/faqs-policies/weapons-policy/ list that it can be translucent, be half covered in bright colors, or have an Orange tip/plug. So would it be OK to just have the orange tip?
If your prop weapon is a toy, look-alike, or imitation firearm, then federal regulations (15 CFR § 272.3) require that it either be translucent enough to, permit unmistakable observation of the device’s complete contents, or must have at least one of the following:
An Orange Solid Plug in Barrel: Have a blaze orange (Fed-Std-595B 12199) or orange color brighter than that specified by the federal standard color number solid plug permanently affixed to the muzzle end of the barrel as an integral part of the entire device and recessed no more than 6 millimeters from the muzzle end of the barrel; or
An Orange Barrel Marking: A blaze orange (Fed-Std-595B 12199) or orange color brighter than that specified by the Federal Standard color number, marking permanently affixed to the exterior surface of the barrel, covering the circumference of the barrel from the muzzle end for a depth of at least 6 millimeters; or
Entire Surface Coloration: Coloration of the entire exterior surface of the device in white, bright red, bright orange, bright yellow, bright green, bright blue, bright pink, or bright purple, either singly or as the predominant color in combination with other colors in any pattern.