Recent content by nervoustrig

This product listing says 120 MoA total adjustment range https://www.amazon.com/WestHunter-Optics-Adjustable-Height-Dovetail/dp/B0DZNKPFF1 So each mark is roughly 30 MoA. Actual compensation depends on how far apart you space the rings. As a sanity check, 0.020” (0.5mm) provides about 20 MoA if...

The fill port O-ring is a common source of leaking in SPA PCPs. It is too soft so it eventually extrudes into the gap formed by the flat on screw #51. Replace it with a 90 durometer. The OEM size is a M1.5x5 but a -008 works equally well in this application. Might want to also check that...

Welcome to AGN! This is a tough one because the strength limitation also probably rules out a breakbarrel. If you can ask around and find someone that owns one you can try, that would be good. I don’t know if a big box store (Walmart, Bass Pro, etc) would go for it but you could ask. A PCP...

10-4. Yeah as long as you’re fine with the trial and error nature of it, there’s nothing to it but to put in the effort. If you’re lucky, the stack already has a couple of shims that you can experiment with removing. Otherwise you’ll have to remove a washer or a nested pair—meaning ) or ))—...

Taking the 1900psi setpoint down to 1600-1700 should get you in the ballpark. Do you have a photo or link to a photo of the regulator internals? My assumption is it is typical paintball style regulator...meaning adjustments are made by trial and error using shims.

I think Kenny is referring to the work of AGN member NoLimits https://www.airgunnation.com/threads/sorting-pellets-by-viewing.1060658/

This tight region sounds like the aforementioned issue present in most LW airgun barrel blanks. Mike of Thomas Air has called attention to it at times, for example: https://www.airgunnation.com/threads/polish-an-lw-polygonal-barrel.1324826/post-1880370 Working it with a poured cast lap and...

Can't say I've ever experienced leading so severe that it produced a 7" shift at 33 yards. A dirty barrel tends to show up as growing group size, for example the described 1" groups increasing to 2", not a huge point of impact (POI) shift that stays for a few shots and then moves somewhere...

Presumably no machining operations were done to the region of the barrel where the perceived loose spot is now. In other words, there is no logical explanation for how the middle of the barrel just spontaneously expanded. Therefore I lean toward subscriber's intuitions that something is...

Just smooth the two surfaces individually. It should not be necessary to lap them together. For the metal part (i.e. the tiny volcano rim), the goal is to have a polished surface free of any microscratches that would allow air to slowly weep through, or contribute to abrading the plastic part...

The washer stack is not exposed to high pressure air, so any good metal lubricant is fine to use. I have used everything from simple 30W non-detergent oil to expensive Krytox at different times over the years and can’t say it makes any meaningful difference. Regarding other things you may want...

...the gas rams to a greater degree than the pumper. If a PCP were added to the graph, it would exhibit increasing energy with increasing pellet weight.

The energy decline with increasing pellet weight you are seeing from the two Gamo rifles is a behavior common to springer (or gas ram) power plants. It is related to the smallish volume of high pressure air available to accelerate the pellet. Pneumatic rifles will generally produce increasing...

Unexpected lateral shifts at a distance are usually some combination of wind and cant error.

White Lightning bicycle chain wax. A very light application, about 10 drops added to a tin and then tumbled to distribute it. I don’t think it does anything meaningful in terms of lubricating properties but it is a protective coating to prevent surface oxidation.