M1893 rifles, M1916, M1933 short rifles- Standard service rifle from 1893 to 1942, after which they were used by police units well into the 1950s. Built on M93 Mauser pattern actions made at Oviedo. M1916 and later actions are plenty strong. Originally chambered for 7X57mm.
M1895 carbines- Made at Oviedo, generally exported, but some special police rifles issued to Spanish police horse units.
Spanish M43 short rifle- Standard service rifle from 1943 until 1958-ish. M98 Mauser action made at La Coruna. Just as strong as a K98k, because it is a M98. Originally chambered in 8X57mm, which was adopted as the Spanish army service round in 1943.
There is no M44 rifle AFAIK.
FR7 rifles- Converted from M1933 short rifles/carbines and M1916 short rifles in the 1950s.
FR8 rifles- Converted from M43 short rifles in the 1950s.
http://www.carbinesforcollectors.com/mauser1.html