This is a rugged little nugget of a mount. At only 30g (1 oz) this CNC machined 6061-T6 aluminium mount is tightly engineered and sculpted. The slide onto my rails was smooth, but be aware, by nature of the "one piece" construction, they don't bolt on, like other rail mounts might. To secure the mount to the rail, a surface-saving, blue-nylon-tipped set screw tightens down with the included hex hey, Ikea-style. You can see it sitting down-rail of my Sstrike Industries Vertical Sling loop
The mount is hard-coat anodized with a matte black finish and is conservatively laser etched with the Strikemark logo.
The rails to mate to the Contour are extremely tight. I needed to add some lubricant to slip mine on, which I did gingerly, for fear of breaking the Contour's plastic siding. Whilst Strikemark offer a "Lifetime warranty on the mount. If it breaks, we replace." I wasn't so sure about Contour. The connection however is rock solid. No shakes, rattles, wobbles or warping, all the concerns raised about the official Contour mount.
Now, you can see my mount here, riding on top of my current tagger (which is a M16A2/M203 analog), as it currently lacks side-rails and it wasn't really in the way for what I do with it. I have plans to mount rails on my Pro Tec Classic helmet to give me a solid mounting point, to avoid the slide and jiggle worries I had with a cap, shoulder and bag-mountings I have tried.
Props to GeardoShit for beating me to the punch, I think we must have both been reminded of this thing at the same time, ordered, received, tested and decided to post at the same time. I literally had put pics up into a draft when his post published! Great minds!