>>63925345
it will work with any rail that has 1/4"-20 threaded holes along the top like a KAC RAS or DD RIS II or other milspec handguards. on the RAS it locks it into place so it actually holds zero, normal free-float rails it doesnt really have as much effect for zero retention but it does help. the main thing it does is give you a monolithic top section so you're not limited to just the length of the receiver to mount optics, for example you could get away with using scope rings versus a big, bendable cantilever mount. i'm not sure what the bolt spacing is for the PRI sleeves, i think it's similar but the actual handguards themselves might have the holes in different locations than STANAG rails