Henry Martini rifle for a game project I'm very excited to be a part of, links for the ArtStation post and the project GIthub are down bellow. Feel o use it on your projects!
https://www.artstation.com/artwork/ArnnYV
https://github.com/Mooses2k/SecretHistories
This model is a retopology and retexture of this one https://sketchfab.com/3d-models/martini-henry-5239f3e1bfa5482eb1f387a2fec37fef