If it's a range-only rifle, the MRF-RX is a great handguard, because it allows you to mount stuff, and that big heavy handguard helps soak up what recoil a 5.56 platform makes.
For your use, I'd be heavily considering (based on cost and you mentioning that simplicity of modifications matters) just turning your existing rifle into a modified SDM-R silhoette.
Install the Centurion C4 12.0 handguard (can do that with metal snips and a dremel if you dislike removing parts, but simpler if you do). Keep the FSP, and you'll have an affordable, solid rail installed that also has 4 sling QD points, is on the lighter end of things, and importantly doesn't require a barrel wrench to install.
If you don't have the upper already, I'd say bump yourself to an 18" upper (HighCaliber, Centurion, Noveske, BCM, ADCO) and pick a rail that works - all of those offer rifle length and extended rails on complete uppers, and I suspect you'd be happiest with the 18" configuration anyway.
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