Yes it's a big "Wildcat" moderator/silencer. It takes off a lot of the blast if rabbiting or foxing. Of course it cant aid the crack. It also helps a lot as a muzzel break and you can stay on target even at 20 mag.
I built it a couple of years ago in 6mm BR Norma to take the mickey out of friends of mine that shoot "Tactical" matches. It runs a 1:7 Lilja match barrel and is throated for 107Gn Lapua moly Scenars. It is scary accurate, the gun is better than I am for sure.
I entered the McQueens match at Bisley in 2007 and placed 6th out of 60 ish competetors. 10 shots 2 seconds exposure 5 seconds away time @ 200 yds random positions in the castle (set of 8 windows).
There were a lot of side bets that it couldent be done with a single shot. (They shoot AW's, Styer SSG's and the like)

It is also great fun as a "varmint" gun if a little expensive for rabbits. It will shoot 57 grain V-max @ around 4000 fps.
I can also get it deer legal for England but I have to run the pressure above book max, but that is the good thing abouts #1's they are built like a bank vault. It is very unsporting for deer though, it is just a sit at dawn and shoot them in the head proposition.

Regards