Just like in Rimfire BR, i am seeing guys "tying down" their rifle to the one pc rest. They say that there isn't anything in the rules that say that you can't.. but if it is "tied" down, how can it be freely picked straight up from the rest.. which is in the rules. To me it seems like "cheating".. This behavior has only started recently as far as i can tell.
In some forms of rimfire benchrest such as ARA, either the front or rear must be able to lift freely upwards. Not both.
ARA Rule
8.4.2.1.2. Both the front and rear rest may not be attached to the stock at the same time. Either the front or the rear of the rifle must be free to be lifted from the rest.