What are peoples opinions on these? Will shooting the gun feel different compared to the standard seals? What other benefits do the offer? I've got quite a collection of HWs and was thinking about trying these out. My latest purchase is a brand new HW77k in .177 so I think I need the 26mm version, is this correct? What confuses me is that they offer 25 and 26mm seals for most of the HW range, so are most older guns 25mm and newer 26mm? Also the design looks different between the sizes, why would this be?

Lots of questions!

Many Thanks as always...