Thanks Martyn,
I didn't think of the density of wood used.
Just looked at the air arms site and it gives a weight difference of 1/2 pound as i expected so if i was buying a new gun and opted for the walnut with one of the expected benefits being a lighter fun i wouldn't be to happy with one that was heavier than the cheaper beech option!
I will probably keep an eye out for a second hand walnut stock but don't think one will turn up in my price range, but you never know, if i get the current stock sorted in the mean time I'll most likely keep it as the air arms gods intended.
Cheers johnj.
Webley Excel, Webley Tomahawk, Air arms khamsin, Air arms Pro Sport, Bam B26-2, Bam B45-3, BSA Mercury, Sharp Innova (licenced Indonesian version).