M14 Op Rod question

[shottist]

It was pointed out to me that some M14 Op Rods have a hole drilled in the forward end cap and some older ones don't. Can any one inform about what is the purpose of this hole? and, is it desirable? Thanks in advance.

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[Gundog 64]

I have been told it was to let water out if the rifle was submerged, dont know if true but there is no plus or minus to the hole.

John