Here is a Taso back block made around the mid to late 1990s that integrate a cocking rod cage into the design.
This is similar to the Bob Long back blocks except for the cage is not removable.
The splash pattern is similar to the pattern I’ve seen on some Taso Autocockers from the mid 1990s. I can’t remember where I found this, but this block is in surprisingly good shape. There are also neat extra cut throughs.
Find Autococker parts on baccipaintball at http://www.baccipaintball.com/parts/semi/autococker.html
And more Autococker articles at https://paintballhistory.com/tag/autococker