New 6 ARC build. Currently have MagPul K2 pistol grip installed. I have long somewhat skinny fingers and it is all wrong for shooting prone with a low bipod. Also the Geissele SD-E flat bow trigger.

What do you recommend? Thanks

All records with an AR15 are shot with an A2 grip.

When slung up in just as artificial a position. I was going to say A2 until I saw bipod.

For off the shelf, BCM Mod 2 or 3, or B5 Type 23.
Otherwise try custom. Get an A2 or other cheap grip and start cutting and bondo-ing it. Maybe try making an M40A3ish grip with the thumb resting vertically.

BCM Mod3

Even on my precision rifles.

Every Magpul that is more vertical like the K2 just leaves a divot where the thumb web sits to make it compatible with small handed people or is too thin in width like the SL. Even the wide grip K2-XL is too short in reach if you choke up.

B5 23 is OK and looks better but the BCM Mod3 just feels better. I choose function over form... so BCM Mod3.

I found using pure vertical grips to suck when not prone and they got me to move the thumb to the strong side... that led to occasional bump fires. Back to BCM Mod3.

All of my ARs have Magpul MOEs. The K2 grip I have sits in the parts box. I shoot my precision ARs low off of a bipod.