.177 Barrel wanted for Webley Premier

[zooma]

I have a very nice boxed Webley Premier that I would like to enter in the new MPL competition - mainly because it has been suggested that Webley pistols are not likely to be very good for shooting acurately at 10 meters - and I like a challenge!

For this I need to find a .177 barrel as I cannot enter the competition with a .22.

Looking at page 112 of the Webely Air Pistol book it looks like my Premier has the "long link P55" so I am guessing I need the same P55 long link type to ensure it fits my Premier?

Any authoritive confirmation of this would be appreciated. If both types of long link barrel will fit then it increases my chances of finding a .177 barrel to fit.

The front of my Premier air cylinder is stamped 63 and I think it was made after June 1966 as it has the extra stop pin in the body to restrict trigger movement if any of this helps.