January 4, 1945 test of the M9E2 rocket launcher, later the M18. The lighter aluminum version of the M9 bazooka
Report 1750 Rocket Launcher M9E2 ( M18) : Free Download, Borrow, and Streaming : Internet Archive. US T74 3.5 Anti tank rocket launcher. Call me crazy, but. 
. The T20 used a spring recoil mechanism and the barrel can be seen recoiling in the rear housing in the first bit of video. There seems to be some differences in the bipod and mount in all of the various photos but the basic weapon still looks the same. In the disassembly photos below, it’s interesting that the launcher seems to have a single monopod spring mount with two feet on a crossbar at the bottom, much like the monopod used with the current 85mm Carl Gustav RR employed by U.S. Special Forces.
![MORTAR 60MM - Shoulder Fired - MORTARS [REF] - U.S. Militaria Forum](https://th.bing.com/th/id/R.c82167965deab782bbc7bc8c6714e1cc?rik=Bj%2bdwLotyuGV9Q&riu=http%3a%2f%2fphotos.imageevent.com%2fricklarson%2fgunphotos%2fhuge%2fScan10022.jpg&ehk=dGdwquF7FDrPLBTdcAytn2UeOWa2aEbiZqEYHx7GKo8%3d&risl=&pid=ImgRaw&r=0)
According to the R&D Record, one shoulder fired 60mm was observed at a demonstration at Quantico in late 1943. Based on that weapon, Springfield Armory made two of the T20 mortars and submitted them to Aberdeen for further tests. The project was then turned over to the Marine Corps Equipment Board for additional refinements and 100 of the mortars were manufactured for overseas tests. No indication regarding where the additonal 100 were made unfortunately. But I’m pretty sure we’re looking at one of those 100 mortars. I don’t know of a surviving example but if it’s anywhere, it’s probably in the vault at Quantico.
