1873 Cavalry Carbine - Tell me something about it

[carbine85]

I just picked this up and took it to the range today. I'm pretty sure the stock isn't correct. The rifle is dated 1880 and the stock is 1884. Tell something about it.

 

[saiga308]

https://armyhistory.org/the-springfield-model-1873-rifle/

The 10th Cavalry, stationed in San Antonio at Fort Sam Houston, was among the first units to receive the new rifles in the spring of 1874. By 1875, the M1873 began to replace the Army’s stocks of older rifles.

 

[saiga308]

http://gun-data.com/springfield_trapdoors.html
1884 a rare year?
580
mass produced it in 1880
9830
14884