I haven't used the Atlas stuff yet, but just installed the PASS gen2 adapter, Atlas feet, and 3" leg extensions on my Harris 6-9 swivel/notched leg bipod. I can twist out the feet, add the extensions to get to a 10"-13" (adapter adds an inch), or stuff 18" wood dowels in the extension legs for sitting.
Seems pretty versatile, will be fun to try out. Mostly I like the idea of not buying multiple bipods when I can make a 7-10 into a 10-13 quickly.
