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graycrait, Unfortunately not everyone has the opportunity to try several mods, and choose what works best for them. They are left with buying mods based on forum reputation, or using published dB values. As you mentioned size of the mod, that could certainly be as large a factor in a purchase...

I like to loop drum solos when I shoot, so anyone that walks by locks onto a repetitive slapping sound to figure it out has an easy answer to, "what was that".

kwaping, I am a retired mechanical engineer, that designs airgun mods for fun.

Hate The Rain, Thanks for collecting that data and for sharing it. You have discovered how difficult it is to collect objective data and make sense of it. Rather than specify how it should be done, I have some general comments, that should be considered my opinion only: Accurate repeatable...

Ask @Firewalker where you can get a Tango Sierra, or a facsimile of one.

Imagine material with compliance, such as memory foam. Liquid that sees air in a mod will tend to run out....

Thanks for posting the video, carlos_hathcock

Shroud vent holes may reduce report as measured near the muzzle, while increasing it to the side. I prefer less noise at my ear. Proponents of rear shroud vents will tell you to stuff the rear of the shroud with felt of foam, to reduce lead dust blown into your face. That stuffing essentially...

If the OD of the liner is hidden then we can't look at it :). How about bore scoping the last foot length of the bore instead? If it all looks the same, either your barrel has no twist, or the scope is rotating with the rifling. No twist seem unlikely, but because twist is programmed into...

carlos_hathcock, I may be imagining it, but over the 4 or 5" depth of barrel bore you captured in that video, there seems to be no rifling twist at all. If you looked at the land impressions at the OD of the liner, is there an even twist from breech to muzzle? If the twist stops 4" inches...

That looks better, Jim. Flaky. More convincingly like lead deposits.

The Panthera has an active shroud, albeit a short one. The first baffle is either a reflex air stripper feeding the rear of the shroud, or the front cap of the shroud acts as the first air stripper. This is important because the first air stripper is works the hardest to cause a lag in air...

You can shoot .177 pellets though a .30 mod and it will work much better than you expect, for two reasons: Airgun power is roughly proportional to bore area. So, there is no way that a 20 FPE .177 is louder than a 60 FPE .30; when fired through a .30 rated mod. The same principle applies to a...

In a nutshell; look for lead build-up at the choke and crown. If there is some, does it correlate with groups opening up?

Per the video, it is for "the cool factor"; a "tactical look"; "just for looks". AKA, bling, not function.

The mag chamber diameter also matters. You don't want to struggle loading the mag, nor have projectiles drop out because the barrel like smaller projectiles. You need to be sure that the barrel bore is properly aligned with all the chambers in the mag. Refining that alignment might help, in...

I was sent these images of a Leshiy Classic with a 350 mm barrel in .25, that might help:

I notice from your other videos that you don't seem to have dB readings over 83, regardless of moderator, or meter placement. This makes me wonder if you are near the maximum reading the meter can measure. If so, the readings near that level are probably not very linear. In other words, a...

It sounds like a bit of research is in order, to see if other GK1 owners have had the same problem.

Is it possible that rapid fire can shoot some slugs at less than full pressure (or valve duration), so getting some slugs stuck in the barrel? That sounds hard to believe, unless a PCP is regulated, or has a plenum, or a depinger that uses a flow restrictor.