The additional weight added to the muzzle will have more effect on reducing muzzle rise then would the vent holes. Usually pistol-caliber muzzle comps are mostly ineffective due to the reduced muzzle pressure/gas volume of pistol ammo versus rifle ammo.
That does not look like a Bruce Gray conversion. This one is:
The compensated longslide definitely reduces muzzle rise. I've always found the recoil of a P7 to be rather sharp. I'm not willing to argue with G3Kurz about whether it's the compensator or increased slide mass, but the combination definitely tames the recoil.
I picked out off another thread on ... man. I can't remember. I linked the photo.. but the photo is coming from the source, not the thread.. i think handguns.net? It's interesting for sure. I've seen suppressed ones.. and maybe another comped P7, but a much shorter comp than this.
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