identify this

[thumper]

spotted this on mcarter - what is that pump guide?

[DeepFreeze]

My guess is that it is a custom job. Punisher has done some phantom under-pump handles that look something like that, but they were less bulky.

[needmorecowbell]

Yeah looks custom like Freeze stated. But that pump handle goes well with the bodies milling

[CaptainMorgan]

My best guess would be expansion chamber or just a plane rod screwed into the body of an autococker where the Front block mounts leaving the barrel exposed. only reason I say this is the rod is machined for a wrench. I do agree that is one nice custom job whoever did it did a nice job.