It should be, you'll need to buy the weapon with the picatinny rail instead of the standard rail sight.
i think i tried both, the one with the standard L85 rail and the other... it would kind of defeat the purpose if you could only use the SUSAT on weaver rails tho. afaik it doesn't fit them in reality, and the SUSAT is generally a pretty crappy/basic scope i don't think is fielded anywhere besides on stock L85's.
its not a life changing issue or anything, but that you can't fit the SUSAT on the stock L85 feels odd and i wouldn't know what else you would use it for if you're not sticking it on the L85.
