Vulcan gen 4 clipping moderator
I have now tried 2 separate hugget magna moderators on my brand new Vulcan gen 4, with the adaptor and the second with out the adaptor screwing directly on to the shroud, what I have found is depending how much the moderator is screwed onto the shroud will effect the clipping? By this I mean I have to screw the moderator on but stop before it gets tight to eliminate clipping, as soon as I tighten it fully, it clips?!?!?
I have since put a rubber washer between the mod and the thread as seen here
I am at a loose end as every time I use the gun I have to essentially zero the moderator by turning it using the slight give of the rubber washer till it groups. What I did notice is the baffle thread almost sits off
What could the possible issues be? And just to clarify when shooting with out the mod it is precise.
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:8:
one of my Vulcans, the one i had second hand had a wrong caliber shroud on it. one size down. that would cause also problems.
it did not have the k baffles in but it was a monoblock, but i remember i could stick a fat/large McDonalds straw down the front, this was replaced by an evidently larger exit aperture shroud. the internal chambers dividing walls on the last .25 shroud looked like ///. the original i had was ()()()…
Just want to update this thread for those curious on the cause, I exchange the shroud and it fixed the problem :8:
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I don’t own a Vulcan but made my own custom LDC from time to time.
The hard thing is alignment of the baffles to the muzzle of the LDC, and the hardest thing is making all that align to the bore of the Airgun in itself.
So hard that most manufacturers make their LDC a bit less effective by increasing the tolerance of the passage size.
Where going up by one caliber size would be best but to be intolerance with the uncertainty of the attachment points they stay on safer side they go up by two.
For example an LDC for a 177 cal would have about a 25 cal size cap hole and a 22 a 30 cal and so on.
To find where the misalignment is will call for some unorthodox methods and everything that you were taught about gun safety will be on your mind.
But you need to make it safe, like maybe degass the gun before this or some how block the loading area with something.
Just because there is no pellet load that doesn’t mean it can’t still take your eye out, the air blast alone can do it !
Just engaging the safety is not good enough for this test too.
You can even try and use your cell phone in selfie mode to do the dirty deed.
But with the breech open you’ll need to light up the area with a flashlight to sight down into the muzzle end.
From looking into the muzzle start focusing from the loading port and try to sight it on center with the barrel crown.
It will most likely already be hard to do.
Start to loosen the LDC (since that is where your problem started) off of the adaptor and see where the misalignment is happening so you can try to address the cause(s) of this problem.
Or you might need to start at the factory shroud attachment point like Kris posted ?
Sounds to me that the adaptors male thread going into the LDC maybe a bit too long to begin with or bottoming out/binding on something inside the LDCs back end, causing misalignment of a baffle or inners ?
Or be defective or slightly incompatible with the combination of brands, LDC/Adapter/Vulcan ?
…. …. . . in any case, good luck with that Sir.
~ Greg
If it’s the shroud then I’d assume it’s not the threads of the shroud, but that the end is not finished perpendicular to its length? That way when you tighten it down it conforms to that angle it’s off by.
It’s potentially looking like the baffle is the cause but can’t confirm that yet
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Some part somewhere in the chain is probably not concentrically machined. Could be the adapter or the LDC. It happens and only a replacement will suffice. But you have to determine what’s out of spec first.
not my video but a new shroud fixed the problem. an additional mod/extension will magnify the issue
dont mod the exit aperture it will get louder. Do not use it like that, it is very dangerous you never know what direction the pellet will fly
I’ve got the same issues, it’s down to the threads on the shroud, or the adaptor. Them being slightly off will be exaggerated by the longer mods..a magna being one of the longest. The standard hole in the end cap is 7.62mm open that to 9.5mm. Problem sorted.
When it comes to threads on multiple things making sure they’re all 100% in kind is fairly difficult.
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Glad to hear it!