I recommend Aero Precision ATLAS R-ONE M-LOK or Leapers UTG PRO AR15 Mid Length 9in the handguard. Both are inexpensive free float handguards that will fit with minor modifications. I do not believe there is a free-floated handguard that is drop-in without modification needed. I hope this helps!

Romaun, here are 2 drop in style, no modifications needed and priced right >>>>> https://monstrumtactical.com/ar-15-quad-rail-handguard-carbine-length-drop-in-black/ ----AND extended rail >>>> https://monstrumtactical.com/ar-15-quad-rail-extended-drop-in-fsp-cutout/

It will fit any Hanguard if you replace the gas block with a low profile gas block, which can be really easy if you have the correct tools
Gas blocks sold here
brownells.com/rifle-parts/gas-system-parts/gas-blocks/index.htm
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Benchblock sold here
realavid.com/product/ar15-master-bench-block/
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Push pin punch set here
budsgunshop.com/product_info.php/products_id/711019964 />-------------
Bench block here also
budsgunshop.com/product_info.php/products_id/713082927 />-------------
Install video here
https://youtu.be/LNbp8KDaTcw
After the gas block is low profile you can run any hand guard you want.
I'm a big fan of BCM handguards, in stock here
joeboboutfitters.com/BCM-AR-15-MCMR-M-LOK-Handguard-p/bcm-mcmr-556.htm
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Some other good ones here (Odin works, midwest industries, Troy, Seekins precision)
joeboboutfitters.com/Free-Float-Handguards-s/184813.htm

Romaun, you can attach a Rail Section to a Standard Hand guard : youtube.com/watch?v=lT-da_KqV4M ------------- A Free Float Hand guard will require a different barrel nut or this will drop right in : budsgunshop.com/product_info.php/products_id/82624/sun+optics+quad+rail