Dan, I also have noticed that the new spring guide is a different size (aprox 1mm larger diameter) and prevents such entering the end. Got one to replace the very marked original caused by the savage spring. Will get the new one turned down eventually. What to me appears strange are the multiple small differences throughout, so definitely rather than replicate the original these are from completely different toolobg/specs - plus no mention of this version in the excellent Webley air pistols book by Gordon Bruce.