So there are a few older posts out there that aren't as in depth as we'd like to go on this. I'll do my best to give a detailed but susinct version here. First things, first: Running a suppressor on a Gunner profile or even Pencil profile barrel is fine and will function fine. There are just some caveats that you need to be aware of if you want to run a suppression on a light profile barrel (regardless of who makes said barrel). Most notably: Light profile barrels will experience barrel whip and some deflection when a heavy muzzle device (I.E. a suppressor) is mounted to them. This will cause POI shift when comparing to how the barrel shoots unsuppressed. If you are going back and forth from suppressed to unsuppressed, then this will be annoying since your zero will change everytime you mount the suppressor. Barrels with a thicker diameter that gives more rigidity will not see as much deflection or whip, so we usually recommend them for suppressor hosts. In the same vein, lighter cans will produce less deflection and whip, so this will vary greatly depending on the can and your mounting solution.
If you are using a direct thread suppressor then you will also run into the issue that the lighter barrels (with .625" diameter gas block journals) will have less shoulder at the muzzle threads so it can be harder to ensure the suppressor stays concentric (this is less of a concern with oversized cans I.E. a .30 cal can on a 5.56 barrel). This is less common of an issue, but still worth noting if you are running a direct thread can.
To get to the root of your question, there is not a disclaimer because it's not really something we advise against or for, but just something to consider when mounting a suppressor. It's just a reality of using a heavy muzzle device like a suppressor on a light profile barrel. It is a question that comes up a lot though so we will work on getting an FAQ or some kind of reference material for this posted. It should also be able to go into a bit more detail than I did here. You can also always hit us up with questions here or via our CS email or phone line ([email protected]
and 513-280-8861 respectively) and pick our brains a bit!