Thanks for the information. The rifle barrel is 32 inches. Your Krag at 23 inches would be a carbine. The front sight sleeve mounting looks original except there would have been a rail on the underside to attach the bayonet. It was probably ground off when the piece was sporterized.

The A in the bbl serial number not withstanding, the piece could likely have been the standard infantry carbine model and not the Artillery model.

The "B" stamp is the inspector at final manufacture. The 1900 date would be year of manufacture.

Hope that explains what you wanted to know.

Cat Man