Where to get a round handguard cap for a pencil barrel...

[onley11]

I'm building a superlite AR out of my old cali bushmaster carbon 15. I want to make it as light as possible. I already have a 1/7 16" colt pencil barrel, but along the way I lost/gave away/sold the handguard cap that fits the skinny barrel. Anyone know where to get another? I've searched around, but I can't find one... I'm trying to avoid having to buy a free float for it. Lots for a M4 but not for a car profile...