I have noticed there are two diffrent pintles. Which one is correct for the m2 tripod? One has one groove and the other has two. I think that one is called a .30 caliber pintel or a 1917 pintle and the other .30/.50 pintle.
The 30 pintle has one ring, to engage with the latch on the M2,, the 30/50 has the two rings,, one to engage with the M2 and the second for the M3. They will both work with the M2,, the 30 is just more specifically for the M2.
As the name implies the .30 cal pintle was designed for the .30 cal (M2/M122 tripod). The .30/.50 was designed to provide interchangeability between the .50 cal and the .30 cal tripods. Either one will work with the M2 tripod. The .30 cal style is the older one. I am not sure when the .30/.50 came into use.
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