well I’m not sure if it’s his but I saw it on his new DVD JM Practical Rifle from Brownells.
he has a chain that links both feet of the bipod together tightly so that you can pull on one leg and the other will follow, quickening the release of the bipod in 3gun matches.
Here’s a 6inch length of chain I bought from Home Depot for 30cents. I went with black so it doesn’t look too out of place.
After mounting to each side using pliers etc :
Pulling on one side and you can see the other side will follow :
Fully extended :
The Silver bipod feet is The Bi-Slide by Bruce Piatt so that you can slide your bipod to transition from target to target much faster than a standard bipod feet will, since it’s super smooth.