Here's one of the barrels which is likely to be OK. It is sleeved and 0.020" bored. Should go to 0.040" OK.
I found seven A10 barrels and one A7 in various states. Two are bored with pistons. which are earmarked for projects if I live long enough.
If you are interested, PM me with an email address and we will sort something out.
Trevor.