If you are not already a member, I would suggest registering for TnGunOwners.com
You can find some good info about gun related topics and especially the class 3 items.
When you shop for a suppressor, also keep in mind the cold bore vs. warm bore POI change.... and also the POA/POI change between unsuppressed/suppressed. Db reduction will vary, but the best results will come from the titanium products, although they will be pricier.... you will see a weight reduction and longer lasting material.
Do what you want for mounting options.... I would go with just the simple thread on version.... cheaper and simpler. If you buy a 30 cal "can" and plan to put it on a .223, all you need is the thread adapter. Most "can" manufacturers sell those too.