[quote=CirusArvennicus]
That's your opinion and you're entitled to it. But I'm not buyin' it, so Demon Weapons cannot use wavelength. Not until they're Demon Scythes, but at that point, you've transcended 'Demon Weapon'.
[/quote]

What's my oppinion? That Justin was an autonomous weapon? That's not an opinion, that's a fact that was directly stated by Stein in the manga. Just about the time he started beating the shit out of him with Marie.