This forum is a good place to start. I am not a uniform collector, so I don't think I can be of much help to you, but I never know what I may run across if I know what I am looking for.   I would suggest posting a picture of what you are looking for. What size you are looking for. Anything specific on you are looking for. What price range you are willing to pay, then just ask if anyone runs across a jacket like this, please keep me in mind. You have everything to gain and nothing to lose.   I don't know what shipping from the US to Sweden would be. That may be something you want to check into first. It could be cost prohibitive from here. There are a several members in Europe, so you may check postage from there as well before you make your decision. 

No worries man 😂 I do the same thing all the time

Shelby Stanton's Vietnam Order of Battle may have some info. I'm in the process of moving and my copy is packed away somewhere, otherwise I'd look it up for you.

I was told the Sharpshooter is from the 20s

Hello Fellow Members,   Are these WWII bullion pilots wings English or US made?  The backing material appears to be the standard US Army officer tunic material.   Many Thanks! Dave.

Anyways to actually contribute to the topic, I believe the sixth ID painted the 6 sided star on helmet going into the Meuse Argon, I may be wrong, but I feel like I have seen photos or read something about that in a period unit paper or something of the sort.

Oh my, it’s been a Long day, That is not true, disregard what I said, I was thinking ww2! Sorry for that! 

Note the subject is "pre armistice division/unit marked helmets, " so that's WW1. The WW1 9th Division was formed late in the war and did not go overseas.

Another thought. If you have a vise stout enough to hold your receiver section, a large pipe wrench will likely crank that barrel on, though the surface will definitely get chewed up where the wrench bites or slips.   The Marines barreled M1903 Springfield rifles using plumbers pipe vises. Those will also leave a mark.

I thought the 9th Id were stateside when the war ended and never deployed?