I have for sale 1 each (used) .22 Short kit for the Ruger 10/22.
I never had any problems using this and it is in very good condition.
Price: $205.00 (includes shipping)
The kit includes:
.22 Short Bolt Assembly
.22 Short Hammer Spring
.22 Short Recoil Guide Rod and Spring
2 each 10 round .22 Short magazines