Lots of good info here. I'll put in my two cents
I agree with the direct thread option regarding the noise if a suppressor isn't used on that rifle, but...... doesn't all of the rifles that you are using it on have to be the same thread pitch?
Example, I use mine on an AR that is threaded 1/2-28 a rifle with a 9/16-24 and a couple that are threaded 5/8-24. A direct thread would not work for me. Plus, some barrels are thick enough for a larger thread like 5/8 and some gunsmiths feel that 1/2" thread leave too little metal left on large bore rifles
Back to the Ultra7. If weight is not a priority for you, there are a bunch of quality cans that are cheaper than an Ultra7. I bought one because I wanted a light one for my hunting rifle. I do have a Hybrid in jail right now though. Need something that will work on guns over 30 cal
Trusts- if you are not planning on sharing or dont want your son to take it hunting without you, go individual. When you die, it is easy to transfer it to him. The biggest thing is you have to be present for someone to use it.
22 cans- you will want one. If you an afford it, do it at the same time as your other. I waited 2 months to save up after I went through the hassle of the first one.