Looks nice, but from everything I've read, the guidons, or rather the flank markers were carried on poles not inserted in the rifle barrel.
Both was done, what exactly was done in the 20th Maine we do not know. As I wrote in the blog, the guidons on poles are much more common than inserted into the barrels of a gun.
If you take a look at this screenshot from the blog, you can see the guides having guidons on poles. On the other one you can see the flank marker inserted into the barrel. For the 20th Maine we will offer both.
We would like to note that we do not have much informations about the type of guidon (if any) the 20th Maine carried. As such, we will offer both the more traditional guidon on a pole and a guidon that can be inserted into the gun barrel. We have based the design of both on existing guidons from other Maine units, as that is the closest thing to the 20th Maine we could find.
flank marker on poles:
Flank marker inserted into gun barrel:
I have read before and seen several drawings of the guides inverting their rifles and holding them upside down, with the butt in the air to compensate for not having a guidon. This was done during the Napoleonic Wars, and supposedly also in the CW. I was thinking about making an animation for it, although it would be fairly useless, as all guides in the game will have access to flank markers anyway.