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The M18 was the standard mask of the Belgian Army in World War 1 after the french ARS.
Mask overview Edit
Practically a GM-17/18 with a 42 mm filter thread.
The filter Edit
The filter was the same as the ARS.
The kit Edit
The M18 came with an ARS kit, complete with a metal box with bilingual instruction and an ARS 42 mm filter.
First variant Edit
The first variant was derived from the GM-17
Second variant Edit
Very few GM-18 were made, and even fewer were captured and turned into M18 masks of the second variant.