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No, but the scope tube does not need to be precisely aligned with the bore. The erector tube does, since it is the thing we are looking through to aim. In other words, if we didn't have a floating erector tube inside the scope body, and the ability to manipulate it via the turrets, we would...

Here's a step-by-step that I wrote up a few weeks ago. https://www.airgunnation.com/threads/how-important-is-perfect-level-your-scope-to-your-gun.1321579/post-1842081 The number of steps will initially make it seem more complicated than it actually is, but don't hesitate to ask questions if...

For loading a magazine, tweezers. I'm a little OCD about the potential of damaging the skirts so I extended the tips with little pieces of music wire covered with heatshrink tubing.

Some do better than others. Some key factors are the seat size, geometry, and surface quality. This thread may be of interest: https://www.airgunnation.com/threads/drop-in-reg-pressure-over-a-string-of-shots.1293373/

Thomas, you are on the right track. SPA is in the habit of using FKM (Viton), but be advised it offers no particular advantage for a breech seal. Feel free to go with a Buna-N or polyurethane replacement.

The OEM set screws have a cup point which is why they score the surface so easily. You can blunt and polish the tips and that will vastly reduce the propensity to dig in. Or you can get set screws with an embedded tip made of either nylon or brass. https://www.mcmaster.com/products/set-screws/...

https://xisicousa.com/PartsDiagram/XSsentrydiagramlist.pdf From a casual look at the exploded diagram, I'm not seeing a burst disk. My guess would be an O-ring was beginning to extrude and gave way as the pressure was rising during the fill. My advice would be to try filling and listen for...

I doubt you hurt it. In the off chance you did, what you would be on the lookout for are: 1. When zeroing, adjusting the turrets does not move the point of impact as expected, and/or 2. It doesn’t hold the zero.

You removed the cap for the spring that supports the erector tube.

The only pellet I’ve ever recovered from game that produced any useful expansion is the Daisy .22 hollow point.

Just FYI the gunk is abraded material lost from the O-ring. Polishing the rod will indeed reduce friction (both break-out and running friction), and the corresponding material loss.

Preaching to the choir! Any rifle I'm planning to use for pest control goes through a similar proving out process. For example, shortly after a reg rebuild on the DAR .25 cal: Each of the next two nights, it delivered dirt naps to a couple of trash pandas...

Okay I think I see what you are referring to. Yes, if the intention is to dial the elevation turret when shooting at varying ranges, it is preferable to index off of the turret cap (or some other external feature of the scope). In so doing, one can be reasonably assured the reticle will travel...

What is a “scope indexing plane”? This is a term I have never encountered, and seemingly neither is Google aware of it.

Please bear in mind that any scope mounting strategy which starts with a spirit level to level the gun is making a variety of assumptions about the perfectness of the gun, the scope, and the scope mounts. The beauty of the mirror method is it singularly sidesteps all of these potential...

There is a very popular misconception that installing a scope must start with leveling the gun. Granted, one can get a pretty decent result most of the time by leveling the gun and then leveling the scope, but there are over a half dozen potential sources of error that can diminish it. What...

Cant error is proportional to the projectile's drop, and since pellets drop quickly, cant error comes into play at relatively short distances....much shorter than it does with centerfire rifles, for example. A 10.3gr JSB pellet will have as much cant error at 100 yards as a 30-06 will have at...

Do you happen to recall whether the corrosion was outside of the O-rings or between them?

Well, I'm back from my short stint over at the Stitch-In-Time forums. Out of respect for the craft, I took some time to educate myself on the language and one of the things I learned is they blend the words sewing and artist into a "sewist" portmanteau. Armed with this knowledge I dove off...

FWIW I've seen that a lot with the 177 Baracudas for several years now. I don't know how long the dies last but I would have assumed they've cycled through, and what we are seeing is the new normal. Nevertheless, most of the batches I've received grouped well in several rifles.