It's only about a month old, too hold-sensitive for me.
I didn't give it a "full tune"... but I pulled the power plant apart, deburred the slot and holes, and installed a new seal (the original had a little damage). I also opened the transfer port up a smidgen (by 1/32") because that always seemed to help a Gamo or B19 in this caliber... but it didn't seem to help on this gun.
It seems to like Gamo Match pellets, which it spits out at around 700fps. For some reason it shoots a little high even with the rear sight all the way down, but I had no trouble getting a scope sighted in, even without an adjustable mount.
I didn't bother with a pic because, well, the gun is in excellent condition - and I assume that everyone knows what a B26 looks like!
Make offer. I know that these things go NEW for only $140 with shipping - so my expectations are reasonable.