Removing Gas Block on an MP44 Barrel

At the risk of looking even more naive about things of this nature….what may I ask is a “Barrel Fitting Tool, that uses allthreads” is? Let alone, where might someone find something like this?
 
At the risk of looking even more naive about things of this nature….what may I ask is a “Barrel Fitting Tool, that uses allthreads” is? Let alone, where might someone find something like this?
I lieu of a hydraulic press, special blocks are used in conjunction with all thread and nuts to push/pull components either on or off their positions on the barrel.

Mostly, these would be home made and can be made with fairly basic tools.
 
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