Quote History Quoted:
All records with an AR15 are shot with an A2 grip.
View Quote
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.