This is what my SPX (2013 vintage) looks like. I started fitting my CFR tonight. As William said the outer wing / receiver retainer needs to be relieved for the proper fit. That part was simple. Shaping the outer dimensions to fit the hand guard radius takes a bit of time. Go slow as you can't add back material once removed. I plan to use a 600 grit sandpaper when done to polish back up the modified / fit CFR. Once complete I will fit my JM Pro with an additional CFR I purchased.