I'm both annoyed and happy right now... Mostly happy. So I worked out how much of the CF sleeve to remove from the donor barrel... While removing the sleeve on the lathe, it comes off. Nothing dangerous, but the section of sleeve I'm working on comes loose. Great! But that means the Loctite didn't fully cure... That's not great. I may have to re-think barrel sleeving in the future, and what I use to glue the CF sleeve into place. It's probably my fault for not cleaning and roughing up the surfaces enough... But still. I think I'd be happier with an epoxy, rather than Loctite. Not knocking it- MANY people have successfully used Loctite. I will simply go another route when sleeving barrels in CF.
A tip for cleanup-----I keep acetone in one of those widemouth spray bottles from home depot. That makes it easy to dispense on a paper towel, or directly on the workpiece. I also keep acetone in those push down pump type dispenser bottles, both work well for keeping it handy around the shop.
...I believe Bob Sterne baked his barrel in a low heat oven to fully cure the loctite..
A couple of infrared heat lamps in a cardboard box and thermometer should work..
Thanks for mentioning the part about post-cure baking/heating. Use a similar process, just not in the oven. This made me realize I wasn't very clear about the failure I experienced. it wasn't a failure due to the loctite not curing---all of the loctite was fully cured and required scraping to remove from the barrel. There just wasn't enough of it, lol... My issue was uneven/incomplete fill of the void between barrel and sleeve.
The Talon Tunes tank adapter arrived- my measurements were close enough! The larger 62 cu in tank fits like a factory size tank- i.e. the top of the tank is in line (maybe very slightly below) with the scope rail. If it turns out to be not very comfortable, I've always got that angled tank adapter...I've made some barrel bushings today- they fit tighter than factory bushings, so I'm happy! I just need to get the barrel machined on the breech end to AF specs. I'll have to farm that out though, as I don't have a way to mount my 4 jaw, or a way to indicate off the bore. It's fine- I already have someone lined up to do the work. I'm also just going to run a factory grip and fore end. This is more of an experimental platform to see how these 6mm Bowman slugs do... If the preliminary tests show promise, I'll invest in a longer barrel. For now, 20" will have to do!