can you help identify an old black powder rifle?

Question

supposed to be German, model 1842. It is marked as follows: On lock plate behind hammer, in scroll, a large "M" with a small "re"( lower case) even with top of the M then a large scrolled "N" with a lower case "le" even with the top of the N below that is lower case scrolled "de" followed by a large scrolled "M" and the rest is worn off. just behind the hammer is a small oval with a 3 pointed crown and a letter G in it.on the barrel in front of the nipple is the serial number (low 1000) in front of that is a diamond shape with an H in it. Below that is a large MN stamped in the barrel. on the tang area, behind the fixed rear site is a large scrolled M and the lower case le then "1842" then a large screw head then a scrolled (possibly) T. on the left side of the barrel opposite the nipple is an oval with a "M" and a small symbol over it inside the oval. Behind that is another oval with an "S" with another symbol over it inside the oval. The barrel has three bands and is 40 1/8 "inches

the bore measures .714 and appears to be rifled with 1/4" wide grooves, on the base of the stock it says "MUIZIG" The metal disc in the side of the buttstock has faded lettering around it, and faded numbers stamped in it.Stamped on the barrel bands is a diamond with a "B" in it and a 3 pointed shiled with an "F" or an "E" in it. It has a bayonet lug similar to the springfield musket under the barrel. The ram rod is missing.

EMT-B and JD Thank you for your help, I was able to research info on the conversion prior to my question, but that was as far as I could go with my research, I found I was lacking in books for the period. I'll remedy that, do either of you know what the script was supposed to read on the lock? I't's badly worn there. Any recomendations on where I can find more info?
Thanks for any input!!

Answer 1

I think you have a Model 1816 (Type) "Conversion" Rifle manufactured in 1822 and manufactured in the National Armory at Mutzig.(French, not German) These were originally manufactured as smooth bore muskets and had a Flintlock...Around the 1840's many of these were "converted" to percussion style locks, and rifling was cut into the barrel as part of this conversion along with the addition of a rear sight. These conversions were marked with either M1822 and/or the letter "T" or "MN" to signify it is in fact a conversion.(Some of these rifles were also marked with the letters "BIS"..written in script) Some of these firearms made their way to the U.S. and were used by Confederate troops during the American Civil War (1861-1865)..These Mutzig rifles were the basis for many of the rifle designs that came about during and after the American Civil War

Answer 2

french model 1842
mutzig arsenal