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I don't think HL did a recoil version of the 2A6. But on the plus side since HL use the same HL airsoft in all the tanks then you should be able to use the HL recoil unit.
Are you using IBU or Clark ? The HL Leo is recoil ready as I don't believe you need to do anything to the barrel. Mine has the Clark board fitted with a servo recoil.
All you need to do if using any system that supports servo recoil is chop off the bottom 1/3 of the airsoft unit and mount the servo on the side. You may have to cobble together an extension to the rear of the gun barrel to get the correct length to engage the servo horn but its no big deal. Been using this on both airsoft and recoil units on my DBC equiped tanks for a while and it's worked fine. Hope this helped.
Tankman