A liner is easy in Germany.

https://pesltd.uk/?product=66-0075L

https://pesltd.uk/?product=66-1190PES

As are all the other parts you'll require.

Mark

email (option): pes.sales@btconnect.com

I'm not aware of any +.080" pistons for the M20...If your barrel is good other than the liner I'd say a new liner and piston is the way to go..(bearing in mind that if you do buy another barrel you may have to do seats and valve guides as well)....Ian

email (option): ian@wright52.plus.com

Fortunately, I have found someone else in Germany who has a liner in stock. I was really lucky!
The cylinder is still very good, I will replace the liner and put in a new piston.
BG
Magnus