An RSA, VTAC LPSM, or Fortis QD, or the standard DD/GearSector/KAC Side QD cups can immediately solve the sling issue - and with options, over an integral unit (a 9" for that barrel length) that has a mount built in.
For a future double stamp host upper, 10.3, 10.5, or 11.5 is money, and the short list of handguards would be the Mk18RIS-II, DD 9.0 (Lite or OmegaX), Centurion C4 9", LT 9.0 - any combination thereof would be just fine. The price point of the DD Mk18 complete and Centurion complete upper (if you prefer that rail) are hard to beat.
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Semper Fi
"Being able to do the basics, on demand, takes practice. " - Sinister
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