I pulled off the fishgill handguard. This came off a early p556 and doesn't have bottom factory rail. I put on a picatinny rail section via mlok screws.

Factory? 3hole top rail with integrated rear sight and shims. Top rail has some coating wear (chipped off) If there's any interest, email me at [email protected] and we can talk a price as I have no clue what to value these at.