These tools are waste of money. They are too flimsy to work properly, no matter who makes them. In order to move Mosin sight the armorer has to clamp the barrel in the soft jawed vise and drift the sight assembly with proper punch. Sometimes one need a bigger hammer to budge it.
Second thing is that barrel thickness varies from year to year. during ww2 they made barrels so rough and thick that even standard bayonets won't fit. Even bayos won't fit from rifle to rifle, so how do you expect this tool to work on all rifles? I won't even get in M38 or M44 territory as barrels were made out of speck as it was up to machinist at the factory to decide how much metal to take off.
Invest in proper vise and good bench, quality brass punches that will work on all future projects, that's my advise.