#1. It is not a board or plate.
Key word: rigid board ‘vs’ flexible.
Anyones can see it is not a board, it can be folded, or rolled if you wish to.

#2. It does not have any guiding means.
I do not make the mat so that the feet slide on any ‘groove’ etc.
I make four divided ‘compartments’ instead of many, to avoid the “guiding means”. You can see that the feet sit-on the center compartment of the mat. I was thinking to make ‘groove’ on the mat to ‘accept’ the feet (it should track better that way) but I know it would be illegal.

#3. As it is not a board or plate, I do ‘think’ it does NOT HAVE TO meet the 24″x12″x1/2″ thick requirement.
Correct me if I’m wrong on this.

#4. My mat does not have any protusions on the bottom & top.
The sand inside would follow the contour of the ground, which make it stable.

#5. I saw various mats used @ the 2013 US Nats & Worlds, from carpet to thick neophrene, or layers/stacked materials which might exceed 1″ thick (either to raise the height or to make them heavier, etc) – I did NOT see any problem, DQ, protest, or someone protested.

#6. I did read somewhere in this great forum that you can use mat of any size under your bipod as long as it is not a rigid board/plate.
And that statement came from some distinguished-great F/TR shooters. I am sure they know “a bit” about F-class shooting/match.

Just my opinion & finding,
seb.

My Thanks to EVERYONES that helped me to create & improve the bipod. Without your helps it won’t be ‘like this’ now!

My special thanks to Paul McMenamin who has been a really good friend and ‘urged’ me to improve/make a better feet. And by the way Paul, I am just an average ‘Joe’ here.

I don’t think it does per the NRA HP Rulebook:

 3.4.1 Rifle Rests –
(b) F-Class Target Rifle (F-TR) Rests – A bipod and/or sling are the only allowed front supports for
the F-TR rifle. The rifle may be supported by a bipod and/or sling and rear support which provide
no positive mechanical method for returning it to its precise point of aim for the prior shot. Subject
to:
(2) The use of any form of a table is prohibited. Separate flat boards or plates not exceeding the
dimensions of the individual rests by two inches are allowed to be placed under the front
and/or rear rests. In the case of a bipod, the board may not exceed the width of 24” nor depth
of 12” and thickness of 1/2”.

It’s not a “flat board” or “plate” and the thickness is greater than 1/2″.

Not trying to take anything away from Seb he does excellent design work.

Seb is consistently thinking outside the box and it is awesome!