Looks exactly like the pipe I got with my Spirit Jets F-18 back in 1989 from Pat Grubbs at the IMS show. Don't know where he got them from. Didn't last, I blew one of the stingers off within 20 or so flights on my .65. I believe there were two sizes, one for .45 size and one for .65-.91. When I later talked to Pat, he thought maybe I got the smaller one. Best I remember, was a long time ago.