Originally Posted By CFletch:
I'd be shocked if they were. The original ones were not rails into mlok on the side with the mlok nut, but a wrap-around thing that very closely followed the contours of the front of the frame, and was secured on the bottom but not the sides. Those might not look removable if you didn't see the bottom where the bolts would be, especially if they've made them even slimmer in newer versions.

I guess it's possible they decided to go full rail, but that would seem to be a step backwards and I'm not sure what the benefit would be for doing so.

@PalmettoStateArmory Josiah, can you answer this question for us?