Vulcan moderator pr...
 

Vulcan moderator problem... help?  

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TJsCustom
(@tjscustom)
Joined: 1 year ago
Posts: 12
2019-06-06 23:53:33  

I know the problem, I'm hoping someone out there has a good solution for me!

I have a problem with my mint condition Vulcan .25 (not Vulcan 2), it is really an odd problem.  The gun used to shoot great & accurate, then one day it was shooting all over the place, I finally figured out that the pellets were slightly rubbing the moderator (DonnyFL) exit hole.  I tried it with 2 other moderators and it was the same problem.  When I shoot it without any external moderator it shoots nice & accurate as before.  At first I thought the shroud/moderator adapter part  was warped or damaged, but it seemed centered as far as I could determine.

In USA, almost all moderators have a 1/2"x20tpi thread, right?  But the Vulcans have a M14x1.25mm external thread.  This is size is very close, and "seems" to be the same, BUT IT IS NOT THE SAME!  It is just lose enough that the moderator can cant (sit slightly eccentric) on the shroud (as mine did).  With the eye, it looks OK, but in reality, it is not center or concentric, so the pellets can brush against the exit hole of the moderator. My .25 moderators have an exit hole of .312", I can drill the exit hole on my moderator .400" or more, and I think this defeats the function of the moderator.

So now I know what the problem is, but I am not sure how to correct the problem.  I tried to use teflon tape on the threads, it tightened up the threads, but did not force it to sit perfectly center.  I also tried to add an o-ring between the moderator and the shroud to compress as it tightens, but again... it tightens it up good, but does nothing to center the shroud on the very loose undersized threads.

VulcanModAdapter

Does anyone have any INTELLIGENT ideas or suggestions?

 

 


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Doug Wall
(@doug-wall)
Joined: 1 year ago
Posts: 103
2019-06-07 06:09:37  

You'll never get the two threads to match properly. The only solution is a properly threaded adapter.


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rkia
 rkia
(@rkia)
Joined: 1 year ago
Posts: 9
2019-06-07 08:44:11  

Call/text/email Donny.


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zx10wall
(@zx10wall)
Joined: 1 year ago
Posts: 45
2019-06-11 22:35:29  

Clean up any damage on your factory shroud and get the correct Moderator:

https://donnyfl.com/collections/ldc/products/1-5-x-6-5-inch-sumo?variant=13285825216555


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James Perotti
(@jpsaxnc)
Joined: 1 year ago
Posts: 73
2019-06-15 07:25:37  

The problem might be barrel harmonics especially so if the barrel is free floating, adding a mod changes the harmonics and the POI. 


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Hepotter
(@hepotter)
Joined: 1 year ago
Posts: 74
2019-06-16 13:06:04  

Jeez...this isn't brain surgery!  Toss the OEM adapter, get the 1.2 X 20 air gun adapter from DonnyFL and your problems will resolve.

 

Hoot


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TJsCustom
(@tjscustom)
Joined: 1 year ago
Posts: 12
2019-06-16 14:27:09  

Hepotter, I did say "Does anyone have any INTELLIGENT ideas or suggestions" but I guess you missed that part?  You obviously don't have any idea what part I'm referring to or you would not have make your dumb & insulting comment.

Just FYI for other readers, those who may have Vulcans.  If you have to butt your mod down firmly to get your mod not to wobble, you do NOT have correct thread mating, and your mod may be eccentric, or it can get bumped eccentric at any time.   DonnyFL now sells mods with the M14-1.25mm thread, BUT it does not fit the Vulcan M14 threads properly (fits just as loose as the 1/2-20 mod).  DonnyFL is such a great guy, he is working with me so he can provide a snug & proper fitting mod for the Vulcan.  I will update this thread when resolved.

 

 


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