Which AccuTac?

For my application is i need a very short bipod as I am shooting from an elevated box stand. I need to be about +- 5" max. I currently have a sling stud on my rig.. I can change if I need to.. 

I need to be able to swivel ( don't need to cant but will be ok if i have to) what AccuTac should I be looking at? Maybe the FC-4G2? What else would I need? A rail? Thanks guys. 
 
For my application is i need a very short bipod as I am shooting from an elevated box stand. I need to be about +- 5" max. I currently have a sling stud on my rig.. I can change if I need to.. 

I need to be able to swivel ( don't need to cant but will be ok if i have to) what AccuTac should I be looking at? Maybe the FC-4G2? What else would I need? A rail? Thanks guys.

Do you have your mind absolutely set on a Accu-tac bipod? Have you considered a mini tripod? I think something like the mini tripod pictured and discussed in this thread may work just fine considering the information you provided. https://www.airgunnation.com/topic/mini-tripod/page/2/

It would also be helpful if you could provide more information. For instance, which gun do you intend to mount it to? And in which sort of configuration (e.g. an FX Impact M3 with an ATN Thor scope weighing in at a total of xx Lbs). Do you intend to be seated, prone, kneeling, or standing?
 
The main thing that stood out to me in his initial post was an AccuTac that swivels (pans)and the FC and PCs are the only models I can think of that do this. The FC 4 or 5 Gen 2 m (I forget which one) has a minimum height of like 5.25” to my recollection. This is slightly higher than what he specified at +/- 5” max. The FCs are also over 1.5lbs. I thought the mini tripod might be able to accomplish a similar task, but more information would be helpful. 


@theLBC raised a good point about angling the legs to lower the profile.