Re: Question on 10/22- 77-22
Well, sort of.
Any 77/22 before this year has a similar arrangement to the 10/22, but not the same.
A non threaded 77/22 barrel can be used on a 10/22 with a spacer since the tenon is longer on a 77/22, and a woodruff ket to handle v-block spacing.
Using a 10/22 barrel on a 77/22 involves setting forward the shoulder and cutting the groove for the LH extractor .
I suspect CZ was trying to capitalize on the popularity of barrel swaps when they changed their mounting system. Probably cheaper, too.