Thanks Zeeker! Congrats on the sticky! The KA aeg version does have the feed tube built in the receiver but probably the bigger question is getting the feeding hole in the HU and the feed tube to line up and get the HU in the correct position so the nozzle is the right depth. The fast HU is smaller diameter than I thought as well so it might just fit with a little persuasion. I am going to have to take a serious look. The stock HU for the KA svg aeg are pretty accurate when shimmed but are made from cheap abs and have some very thin features so they break easy and will wear out over time.