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?

I've used Oak pallet scraps and powdered rosin clamped in my vise or to my workbench as a barrel vise in a pinch (though not on an M1 though the process would be the same). The advantage of the M1/M14 chamber profile is that with the two different radii where the barrel tapers down in front of the chamber is that they pretty much can't spin in a properly set up set of vise blocks short of the blocks failing.  

9th ID MPs had divisional octofoil markings on helmets  

I’ve been pouring over this forum and pictures I’ve found online trying to find out exactly what units marked/painted their division on their helmets. The best I can tell are the 26th,35th and 33rd divisions. I’ve found there might be evidence of the 80th and 7th divisions but I can’t find out for certain on those two. Are there any other units that did before the armistice? Thanks 

Sharpshooter is WWII - CMTC is early 1920’s

I think there may be a large wrench buried somewhere at work. I’ll try to find it on Monday. Holding the barrel down is the challenge for me.  Since this is a dummy wall hangar, I’ve considered possibly doing some kind of surgery. But prefer to be nondestructive if I can.  mikie

I have never seen a CS copy of an Enfield.  That being said, they could have turned out a few samples.  It could be.  I have a CS made sword that I think is a 'sample' model. If your bayonet is, it is incredibly rare.  This scenario did cross my mind.  But since I have never seen one, I ruled it out.  I will admit I am not a bayonet expert but have seen many, owned a few, and sold a few.  Not many will be qualified to make a call on this.     A specialist will need to see this.  I would suggest maybe Old South Military Antiques.  Shannon is very knowledgeable on CS made items.  I had an interaction with him in person recently.  I would start there.  Good luck.  If it is assessed as CS made, it is one for the books!  Please keep us posted!

Here's a Jane Fonda patch I found at a yard sale last year for fifty cents....The father fought in Korea and I believe he said his son was in the Navy during Vietnam....He had a stack of miscellaneous patches for the same price and I kicked myself for not buying the lot, but I'm hoping this one is an old original VN era patch....Bodes