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@Esab, I suggest you confirm this for yourself, but it seems that Italian gun law does not permit you to have a suppressor for your airgun because it shoots at over 7.5 Joule. I was going to suggest a solution to you, but decided to research Italian law first; because I don't want to lead...

Not to be facetious, but are you sure that owning and using airgun suppressor is legal in Italy? If legal to own and use, then it should be legal to purchase locally. So, it is a matter of locating a local airgun shop that sells them; or am I missing something?

That nasty looking jagged pit probably won't affect how the barrel shoots. Time to try it out.

MrP, I don't know if it is possible to shoot "salt rings" from a trumpet style vortex generator, but below are images of a hardware design that may help answer the question. Note that the barrel nut is separate from the trumpet. This is so that you can rotate the salt hopper to face up, as...

Simple trumpet vortex generator STL attached. It is almost 10" long. If that is a problem, then I will shorten it. The OD at the wide end is 50 mm' with a 40 mm lipped opening. Trumpet2 STL is for an 8" long version of the same design, with the same OD.

MrP, I started by watching dozens of vortex generator videos. There are two types and it is possible that I chose the wrong type for attaching to a PCP (pistol). In which case I will have to fix that situation. :) The one type uses a membrane to excite the air column in a short fat drum...

It occurred to me that if one was going to use an o-ring to secure the membrane, then the groove indicated by the blue arrow below, should not be so deep. So, version 2 of the attached rear section of the vortex generator has a shallower groove. Originally I though of the deep groove as a...

For your amusement, I have designed a fly swatting vortex generator to attach your airgun. It has an OD around 2", and a female 1/2-20 thread at the back end. The idea is to spread the blast of a 10 tp 20 FPE PCP and use that to activate the internal diaphragm. That, in turn is intended to...

What you measure will depend on where the sensor is mounted: Nodes will read low, because you are between sections that vibrate at large amplitude. Heavy sensors will alter the barrel vibrations. Some mounting systems may damp vibrations. So, there is more to this than throwing money at...

The FX smooth twist or rifled choke idea was great, as a cost saving. If you want to know what spin rate your pellet achieves using that rifling system, measure it by means of high speed video: An effective twist of 1:36 to 1:48 may be fine for diabolo pellets, but the fact that those rifled...

I think that if you need to open a barrel by more than a few 0.0001", then a lead lap should be used. A felt lap will probably take off more from the lands than the grooves, while a lead lap will do that only in the leade, where you want a taper into the lands anyway.

https://www.gatewaytoairguns.org/GTA/index.php?topic=92999.msg872236#msg872236: Robert Sterne said: " I use the VFG cleaning pellets of the appropriate caliber, on a mandrel that screws into a standard 8-32 cleaning rod, and lap from the breech.... There are two mandrels, the larger for .30...

I think that your statement is completely true for round nose pellets. Wadcutters probably benefit from some spin because they have less mass at the front, and the air flow over the flat nose is less "friendly". Even so, pellets benefit from some spin, to even out the effects of anomalies in...

Taper lapping is real. It takes a "hard" lead lap (or series of laps) on a rotating cleaning rod to do it and a lot of skill. The degree of taper is less than 0.001" down from breech to muzzle on a rifle length barrel. The idea is to ensure that the projectile never goes loose as it travels...

JaceSpace1369 Glad you like it, although yours is a different design to the pic above on this page. I think the version you have is better for higher power. The two in the pic above are intended for lower power. What is the real difference in performance at low, medium and high power...

If you want to sell it, it is superior, until you have something better to sell :) Especially, if it cheaper to produce...

@miksatx printed the above mentioned mods for his own use, and sent me the pic below: Matthias requested a design exactly 4" long, for his .22 GK1, to be mouse fart quiet at 12 FPE. I can't help if the mice identify as nutria :) These mods do not have a flat top "sighting rib" for open sight...

Suggestion: Ask the Weihrauch experts here: https://www.gatewaytoairguns.org/GTA/index.php?board=120.0 Specifically these guys: https://www.gatewaytoairguns.org/GTA/index.php?action=profile;u=33840 https://www.gatewaytoairguns.org/GTA/index.php?action=profile;u=21540

Download = Valve Dump? In case someone wonders why mods are not made strong enough to resist a valve dump, mods are designed to handle muzzle pressure (with margin), not breech pressure (airtank at 4500 PSI in the case of a GK1) . To do the latter would require a very heavy wall; and that...

@Barri_40, is that from a GK1 air tube dump event also?