I still haven't found my bottle adapter.
https://www.ntctrading.net/shop/p/black-oxide-steel-bottle-adapter-with-wrench-flats Once I do, I can put a small rubber stopper in the chamber, fill a pop bottle with gun cleaner, screw it on in place of the flash hider, and invert it. When I'm done soaking the bore, I can flip it back over and everything will drain back in the bottle. I can do the same with most of my AR barrels, but would need to replace the crush washer every time, and that's not happening. I like soaking gun parts overnight or longer in my Cylinder & Slide Dunk-Kit, but not everything will fit in the bucket, and I'm not going to buy a tray long enough to put a barreled receiver in and fill it up. (Or am I? Brownells has tanks for bluing, etc. that might work.) My bucket is about 10" tall and I can soak one end of a rifle or shotgun barrel at a time. If it's just a barrel and no receiver, I could soak a whole 20" barrel if the bucket was still full. But there's been some loss through use over the years, and it's 4" from the top. Even with the barrel leaning on an angle, it's only about 8", and no longer gets the job done. It works on a 14" barrel and that about it. I thought about buying another bucket full, then I could pour some of the old stuff through a coffee filter to strain it, and top off the new bucket as needed.
https://cylinder-slide.com/Category/Dunk