before the context get lost the serial number of the .22 claiber patent rifle above is 31039. the rifle is without any proof so sold before 1891. here is another patent rifle with V/crown between 1891 and 1893 on top in the Dreyse logo

R/crown and "6,5mm" on the right side of the barrel show this rifle was proof after 1912.to bad the serial number is not available but it seem obvious it must be near to the .22 rifle. the rifle was probably rebored or rechamered after 1912 and my own opinion goes to the 6,5x27R.

Courtesy of Alain Daubresse
http://www.littlegun.info/arme%20allemande/a%20dreyse%20gb.htm

I see now that the patent action was made in 3 different length's
a short action

an intermediate length like here for the 11,15x37R

and a long action for cartridges like 10,5x47R

or 11,15x60R

notice the intermediate and the long action having an additional stud on the bolt. this work together with the bolt lever in opened positon as a guide rib.