Scope base?

It seems the picatinny rail is the current mount of choice. The are some advantages as I see it. First the mounting surface is much large then a 11 mm dove tail allowing a more secure scope attachment. The other advantage that I like is with the picatinny you can use a one piece ring (mount) system allowing easy scope swaps from one gun to another. There is nothing that you can’t do using other mounting systems I just think with the pic it’s a little easier. I’ve put picatinny tails on all my powder burners and some of the air rifles.

Some of the air rifles are nicely designed so that you have a choice. The cricket comes to mind