The 18" barrel you have is a lighter profile than a factory 16" HBAR from RRA. Lighter between the receiver and gas port. The PRS does make it balance nicely. The RRA barrels are much too heavy for my liking. The DD Lite Rails are very light, about the same weight as you would have if you had 12" handguards, a handguard cap, delta ring, stock barrel nut, weld spring and retaining clip. The YHM rails are heavier.
If it were me I'd send the RRA barrels to Randall (www.ar15barrels.com) to have them turned down to .650" under the handguards. If you want me to disassemble them to do that let me know (to save you some money). I can also refinish them in Norrells black when they come back (they come back raw steel unless you pay for blasting and reparking).
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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