I have an FC-4 G2 and an FC-5 G2 (picatinny). My shooting situation makes the FC-4 G2 a little better for me. The FC-5 G2 is is for sale. It is practically new with very little use. It has only been used indoors on a shooting bench for a very short time. Asking $300 and I will pay to ship it anywhere in the US lower 48.
https://accu-tac.com/products/fc-5-g2-bipod
https://accu-tac.com/products/fc-5-g2-bipod