Paul “Lucky Duck” Schreck had a few of these Cages remade for a couple Bob Long Ironmen Autocockers we have. These are an almost impossible part to find and as Bob Long told Paul, they were typically the first part to be lost or get taken off.
I wanted to get a batch of ten to sell but they were too expensive so I only got a couple extra. They look great though in gloss black.
And I got lucky and found the threaded back block pictured on ebay a couple weeks ago.
These cages on Bob Long Cocker’s back block would prevent the user from “thumbing” their cocking rod (which boost the velocity) since thumbing this cage would put pressure on the block rather than the cocking rod. From what I’ve read beavertails were required to prevent this and this cage would function the same.