rigbymauser, the Mexican Small Ring Mauser is an intermediate length and the 1909 Argentine Mauser is a standard length DWM made action.

And as a matter of fact we are using a LW #5130 type E barrel scaled to 7mm the barrel shank will be scaled for the 1.300 dia.front ring of the 1910 Mex or the 1.410 dia. of the 1909 Argi front ring.

Allen