I have the ribbed RWS model mounted on my Model 36, but if I had to do it again, I'd have gone with the Beeman. The RWS model installs solidly with a couple of set screws and doesn't need any shims, as it's made for that specific barrel diameter. The Beeman, even though it has shims, also produces a solid mount, as the conical shape on the muzzle end centers the brake and allows for a tight mount. As fatback mentioned, the RWS model has a matte finish. It is a cast aluminum product, while the Beeman is machined from an aluminum blank. In my mind, they both function similarly, but the Beeman looks better.