Replacement rear block for the FX Impact M3 power block versions.
If you have a MK1 or MK2 or earlier MK3 this part is only suitable if you have converted to power block. If you have an M3 please check your existing block it must have 4 holes as shown on the right of the below picture and not 6 holes to be a direct replacement. If your block has 6 holes this part will not match up with the rest of your rifle.

Bare block