Im in need of 9mm barrel blanks

[BigMac]

I am in the process of building a Finnish M31 into a legal semi auto.

To convert this SMG I need to either extend the barrel or build a new one. I want to build a new one.

Anyone know where to get 9mm barrel blanks longer than 16"?? I found some at bronells but the profile was wrong and wow 154 bucks for a strait profile blank!

[BigMac]

Thanks! I'll order one and see if I can turn it into an M31 barrel. I kinda whish it wasn't chrome lined. The chaber for the m31 is right behind the collar. I would have to shorten it up from the chamber side.