^Yup. Took me a solid three hours with a dremel tool and required me to not only dremel the SRX, but some areas of my WE SCAR as well. Beautifully made RIS and now its on there solid; just wasn't born for a WE even though the manufacturer and retailers state it as being compatible.
Truth is, there are a ton of rail systems out there designed for use with multiple brands, however different generations of those models can be subject to different specs, not to mention the spec variance between brands. Whenever I purchase a new piece for a rifle I make sure to set aside a sizeable chunk of time to install as I seldom have anything that "fits like a glove". Sometimes it takes a simple stroke of the dremel, others it takes a couple hours and a bit head or two.
Guardians of Asgaard
NO EGO, ONLY HARD WORK
Primary - Z-Custom VFC ZTW
Secondary - KWA ATP