Trying to identify. Not much to go on.

[UNPROFOR1994]

I can find no reference to a Model 93/95 Mauser with a gas escape port

Neither can I, but I did find this video on YouTube.



Watch 03:45 and you will see a gas port on a M1893. Maybe they improved some M1893's to the M1916 specifications?

Information

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[vintage hunter]

Maybe they improved some M1893's to the M1916 specifications?

Could be, the Spanish adopted a more powerful version of the 7x57 in 1913 so perhaps some older '93's had the gas port added to reduce the chances of an action failure in the event of a case head separation?

[vintage hunter]

May have solved the mystery as to what this action is. Was looking back through old threads for clues and came across a 1927 Oviedo Model 93 with gas port. Thread:
Oviedo Model '93 Mauser, Caliber 7mm, Mfg. 1927