Could they be made for export market and it hasnt been reported in the U.K.? Was the .25 stingray made for U.K. as a few USA forums have reports of them. Then there's talk on one forum of a .25 Vulcan but he does not own it, said he shot it.

Did a bit of googling......

http://bluebookofgunvalues.com/Airgu...OTT_LTD_RIFLES

VULCAN I
177 or .22 cal., SP, BBC, SS, 810/630 FPS, PTFE and O-ring piston seal, PG beech stock with angular forearm, shallow cheekpiece, black rubber buttplate, adj. trigger (to 3 lbs.) with constant sear engagement, manual safety, 40.8 in. OAL, 7.1 lbs. Mfg. 1979-1981.

Vulcan I Deluxe
similar to Vulcan I, except .177 cal. only, special walnut stock, hand checkered forearm and PG, soft rubber buttplate with white line spacer, gold plated trigger and manual safety, 43.8 in. OAL, 7.65 lbs. Mfg. 1980-81.

VULCAN II
.177 or .22 cal., SP, BBC, SS, 830/650 FPS, PTFE and O-ring piston seal, PG beech stock with rounded forearm and plastic grip cap, shallow cheek piece, ventilated rubber buttpad with white line spacer, adj. trigger (to 3 lbs.) with constant sear engagement, manual safety, 43.6 in. OAL, 7.65 lbs. Mfg. 1981-1984.

Vulcan II Deluxe
similar to Vulcan II, except special walnut stock, hand cut checkering, sling swivels. Optional: Special Sporter or Tyrolean stocks of select French Walnut, oil finished, 43.8 in. OAL, 7.85 lbs. Mfg. 1981-1984.

VULCAN III
.177, .22, or .25 (carbine) cal., BBC, 870/660/620 FPS, 11.37 (carbine) or 17.5 in. barrel with threaded muzzle-brake, single-stage "hunter" adj. trigger, integral scope grooves, open sights, beech Monte Carlo stock with recoil pad, 7.6 lbs. Mfg. 1984-2000.

Vulcan III
DeluxeGet Pricing- similar to Vulcan III, except has special walnut stock with hand cut checkering and sling swivels.

XOCET CARBINE
Pricing- .177 or .22, cal., similar to Xocet Rifle, except 36 in. overall. New 2001.




Another forums post, showed up in Google....

#5 Webley barrel query: post #5 The Green Man
Member, 3,526 posts. Gender:Male Interests:Travelling, airguns and photography.
Country:Austria. Region OR County OR State of residence:Solden, Tirol. Posted 02 April 2009 - 04:44 PM

It was a long time ago, but Venom made me a block and barrel for my Vulcan in .25.
The barrel threads into the block and a grub screw keeps it tight (or is supposed to ).
As a last resort, you could try them, but a 2nd hand barrel / rifle might be the best option.