I kinda like em
As above: unbelievably accurate. I am a plinker: cans at 70 yards, my maximum range, are easy, using a 4x20 scope and 3 pumps in .177.
In the eighties you could buy ally end blocks for them, to fit a silencer. My .22 MkII on the photo has that.
If you want, drop me a pm, I know somebody who might be able to help you to find that.
Making your own stock for an Innova will be relatively easy: the inletting is simple.
The original suits me well, but the l.o.p. is quite short. Some Innova's came with a longer stock; look at the photo, it is the .22 MkII.
According to a friend and Innova repairer, the factory in Tokyo changed certain things from batch to batch.
For instance most MkII have a butt plate, but not all.
You could also fit a thick recoil pad to increase l.o.p., or attach a piece of wood.
This is the nicest custom Innova stock I've seen. In the USA. I think I'd prefer the handling and weight of the original though.