Worrpt: OD is 1"
Stilgar: Your puter is broked.
Inferno: Yes. $65.00
Melkson: Unfortunately, I support the AC barrel standard. I have no measurements, knowledge, or tooling to make these for a5's. If there was significant demand, I can acquire this stuff... But I just don't see it happening.
Tangus: Lol! Yeah. You stack 7 python inserts in there.
No. I made a back that takes freak inserts. This is a much-superior format to python. I would venture to say that this length is or is close to the industry standard control bore.