RS will be cheaper for the handguard than PTS. You need some sort of gas block in order to attach the hand-guard ring, unless you have a full flip up front sight as opposed to a RIS mounted flip up front sight.
I can't name companies off the top of my head, but many make barrels that would accomodate a 9" hand guard. The 6" is intended for an M4 length gun, the 9" is more of a mid-length RECCE type gun, possibly an SPR, and a 12" is intended for an M16 length gun.
Hope that helps.
I can't name companies off the top of my head, but many make barrels that would accomodate a 9" hand guard. The 6" is intended for an M4 length gun, the 9" is more of a mid-length RECCE type gun, possibly an SPR, and a 12" is intended for an M16 length gun.
Hope that helps.