A long buttstock extension pieces for an Anschutz .22 LR rifle to the make the small and light rifle to fit an adult.
I printed with supports, but it can be also printed without. Only potential problem locations are the holes for the nuts.
This model is made of two parts as the original bolts that go in the Anschutz stock are too short for an extension this long. A set of nuts and bolts are needed for assembly. I used the original bolts, 2 pieces of M4 x 60mm bolts, 2 pieces of M4 x 35mm and 4 M4 nuts.
The author hasn't provided the model origin yet.