If a shooter were to show up at the match and the device were to be on a rifle, I can not see them not allowing you to shoot. The device as long as it is to the orgional specs should be allow. If they were to say it is no, then any rifle that had a after market or reproduction part should not be allowed to shoot. I would personally never do it to my Model 94 rilfe or Model 96 Carbine but if I were to keep my parts gun then I might would like to have one once I were to get all of the needed parts to bring it back to shooting condition.