Does work if the wad has a hole in the base.....but ,the felt is jammed into the check ,which may or not be a problem......Ive made much better "obturators" by cutting down plastic shotgun cases,and a proper moulded heavy plastic piece would work OK.....but you need a little hook to pull it out......Incidentally ,the Small Arms Commitee opinion of the WR Monkey tail....."accuracy is adversely affected by the wad in front of the bullet"..........Nows ,heres a question.....one of these guns used a bullet as a base obturator,the paper cartridge had the bullet in the base ,and first shot ,a bullet had to be inserted first........confusing for a soldier under fire,but the system worked well.