Chomatsu's gun

Chomatsu's gun will the the one at the top of the picture, but the handle will be changed to a wooden grip.
I know, everyone will now be saying it's not a period firearm.  The point is that on our budget, we can't get a period firearm which can actually fire a blank!  Chomatsu's gun is never focused on, so the alternative was to get any available revolver. We only see the gun shoot and bullets in the chamber, so it should be no issue.  Of course we will choose our angles appropriately also.
If anyone is spending time checking that our guns are correct for the period, they are either 'trainspotters' or we haven't done our job!