You are only confusing people with your 1871/76 "model" designation. There never was such a "model". 1876, as on your carbine, is merely the date of manufacture and acceptance. Such dates were necessary to identify a certain gun in the German military numbering system, as each factory restarted with number 1 each new fiscal year. The correct designation for the action is "Mod.71", as marked on the left side of the receiver. Here you can also see the original configuration of your gun: I.G. stands for Infantrie Gewehr, J.B. for Jägerbüchse ("Jäger" is not only hunter, but the German name for light infantry, called "Rifles" in Britain and "Rangers" in America), Car. for carbine of course. Yes, there was a Mod.71/84 later, marked such on the left side of the receiver, but this was a repeater with tubular magazine.