Thermold FN / FAL-M 20 Round Magazine
20 round black Zytel nylon magazine for FN/FAL, 7.62x51 .308 cal. Metric pattern rifle.
Magazine pinned to 5 rounds.
How do I know if I have a Metric or Inch magazine clip?
Picture shown below with an example.
Metric has a small ramp like block on the top back of the magazine.
Inch has a small block on the top back of the magazine.