Reddit reviews BRAVO COMPANY BCM-KMR-1913-N3-BLK Keymod Nylon Picatinny Rail Section, Black, 3"

Buy a keymod to picatinny rail section. Midwest Industries or BCM should have them since they pushed keymod forever. Lots of picatinny rail mount options for a bipod. Make sure you use blue loctite on any mount screws.

Edit: Amazon for $11 (BCM)

You'll want the RVG. You'll need a Keymod to Picattiny adapter.

Maybe get one made out of aluminum for more strength/rigidity. Then install keymod/rail adapter in location of your choosing, then install RVG on that. Or if you prefer to run the grip all the way forward, the RVG will mount directly to the small picatinny sections at the front of your rail.

Magpul does not make any direct Keymod attachments, as their modular rail design is the M-Lok.

BCM has some direct to Keymod attachments.

It looks like you have a rail section in the grip already. Remove the two screws in the side and slide that section out. Then you'll need to get a keymod rail section to attach to the handguard (or get the proper screws/nuts for the rail section you have). After the rail section is mounted to your handguard you'll be able to attach your grip to it.

EDIT: here is a link to the type of rail section you'll need.
https://www.amazon.com/dp/B013XRY53E/ref=cm_sw_r_cp_apa_i_VPi1CbW68KDPQ

OR...

here is a link to the type of screws/nuts used for keymod.. no guarantee they will be correct for your rail section though.
https://www.amazon.com/dp/B019LBCK5Q/ref=cm_sw_r_cp_apa_i_3Si1CbYME8PRR