I've written a few posts on the Umarex Walther CP99 Compact. It was even featured in my very first YouTube video with my Umarex Walther PPK Full Auto BB Pistol. I do sell the CP99 Compact in my web-store but not the regular version, rather the Recon version. With the Recon version you get a few extras: The Sight Rail, a Red Dot Scope and a Compensator extension which I feel is better value over the standard version.
One thing that I noticed about the Compensator extension is that it's not just an add on simply for looks, this Recon version of the CP99 Compact has a longer barrel inside the compensator which should give the Recon version of the CP99 Compact a bit higher FPS. I will test this theory down the road with my Chrony Chronograph.
Enjoy the picture for now...