Hello and welcome Ulysses6 to the forum from AZ.
I am a proud owner of the Burnside as well. Happy and sad to say that I have to agree with the other input given.
Very little info is out there on the Burnside. Awesome carbine and I have a shooter that I enjoy.
You have to trust these young old bucks for their knowledge on these guns. I will admit that I tend to disagree at times.
But I also can't prove them wrong. I have all matching serial #'s on all parts. Font's look good etc. Yet they tell me it was not done in the actual build. More so for a re-build to keep all matching parts together? Even the butt plate and stock have #'s on them. But yet they say it's a no go. Somehow I find good with that.
Without sending a ton of pics. Just search for my posts dated around June 17th 2020. Hope that helps.
Burnside carbines are sweet. Model 4 and 5 to me are the least trouble. But a collector always loves the earlier.
Enjoy your Burnside whether it be a shooter or a keeper. It's still history. History is priceless in it's special way.
Sending pic of my Burnside and S&H Navy 54 cal. Yes --- it is 54 cal. not 52. Been slugged, chamber cast, etc. Also a proud shooter.
Many will argue that also. But they did play a little back then on size.