I purchased the only one they had in stock. The guy was super helpful. While I was at it I asked about the front flip up sight parts for the newer A5 style hand guards. He immediately knew I was looking to fill the hole on my Brownells parts kit handguard. But they don’t have them.
The fixture was very expensive. If anyone in the U.S. needs to borrow one just to install their barrel properly I’d consider working out a short duration use deal after mine arrives and my barrel is installed.