It is sold by Cdnninvestments but I cant find it on there page, the ad says, built in extended compensator.  For $20 it might be a fun thing to try out.  Would it be a drop in part for a 70 series government model?

I think I have at least one of those still laying around, somewhere, purchased at a gunshow a long time ago.
Depending on the configuration near the end of your barrel, it may drop in.
After minimal shooting with one, I found the crud build up inside that compensator just grinds away at the barrel. (if its the same one)
I think that one is offered in blue and nickel.
The better comps are mounted on the barrel, where the muzzle end of the barrel does not have to go back and forth through the crud.
The only feature I liked was by pushing the comp against a tree, the weapon could be cocked and chambered one handed because it was mounted on the slide.
I would pass on it. Maybe save up for a real comp unit, but at their prices, its a lot more than a fun thing at that point.