You said you already have a long range AR, do why not make this one for CQB?
Take off that scope and throw on an Aimpoint/EOTech and some cheap magpul BUIS.
Pick a foregrip that's comfortable for you and call it a day.
If you already have a long range AR I wouldn't put on a bipod, I'd build this one for CQB so you have two systems for two different purposes.
Just my $0.02
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