Been using mine off and on for several years. I applied 2 layers of duct tape to line the inside of the barrel mount. It's not really of any benefit on a stainless revolver, since I can simply repolish any markings it leaves, but I got tired of doing so (mostly it just rubs a bright line, not any real damage). I'd estimate on blued guns, especially gloss blued, it wouldn't even be noticeable. The tape seems to protect against any marking at all. I've always meant to pull the tape and skim bed the mount with epoxy, but it's so easy to just lay on new tape, the epoxy would be too much elbow grease
I forget exactly, but I think mine are Millet rings. Suppose I'd like to have better rings on there, but I bought them about 10yrs ago for a rimfire rifle because they were cheap, available the day I needed them, and they were silver. Had them in the 'parts drawer' then when I bolted a scope on this SBH and they've been tied to that mount ever since.
Downside to the Weaver 301 is that even with low rings (I believe those are mediums in my pic), the scope rides pretty high over bore, and the overall form is rather large. The 7.5" SBH is already a behemoth, let alone with the Hogue Monogrip, then having a "lift kit" beneath your scope is kinda ungainly. BUT... It shoots dang straight...