Yeah Scoobs, I'm going to try without the rail initially. I did see a scope rail for the 101 which I thought was made by lithgow - but now can't find where it was. There are a few manufacturers though (including in the uk) who make a rail that is shaped around the port. This one is Aust made, the link is under the picture.
http://www.iceng.com.au/2017/02/15/raising-scope-elevation-to-55moa-for-22lr-with-custom-pic-rail/