Picattiny Rail mounted full size bayonet?

[gunsmithcats]

Gents,
My googlefu has failed me.

I need to find a full size bayonet (not that crappy pistol one) that mounts onto a picatinny rail.
This is for overall length requirements on a bullpup. The existing rail goes to almost the edge of the barrel, but i need another 5 inches or so to meet the 30 inches.
Or hell, anythign else that can mount to a rail and extend five inches.
Thanks!

[xibunkrlilkidsx]

is that even legal? never seen anything except a muzzle extension, fake suppresor, flash hider, comp etc.

[gunsmithcats]

Yep, federally the firearm is legal cause its 16in barrel and 26in overall. California requires 30 in overall (not permanent). Which means I could duct tape a wooden dowel arond the end of the barrel and extend it another 4 inches to meet that requirement. Look for something a little less ugly, thus bayonet.