Hmmm, I currently have four caplocks and they all have breach plugs. I have owned another half dozen, and they all have breach plugs. They do require an octagon wrench to take them off. You also need a barrel vise. I simply inlaid my barrel into two oak halves then clamp the barrel between in a heavy shop vise. It does require a lot more equipment. I have a a bit of money sunk into gunsmithing equipment.
Just remember if your going to shoot it out only use a small amount of powder and shoot it into something to capture your cleaning jag. At least point it in a safe direction. A few years ago a fellow knocked down an ok buck on Arrowwood National Wildlife Refuge. He was trying to reload as he walked up to it and the deer was still struggling. In his excitement he forgot to pull his ramrod out and shot it through the buck in two pieces from about ten yards. I would have thought the thing would have disintegrated, but it held together (mostly). He thinks it broke after it hit the deer. I don't know, I came upon it a minute later while he was still looking at it slack jawed. He said he had never shot a muzzleloader and barrowed it from a friend. You can loan some things out, but I would sell or throw away a gun if I loaned it out. :wink:
Edit: If you use hot soapy water, don't let it set and try something else another day. You don't want to rust up your rifle.