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I have a late 1980's springfield bush rifle and the hole in the end of the op rod is much larger in diameter than a usgi m14. Is that because of the short barrel? Other than that they seem identical. Thanks
 

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The hole in the end of the OpRod is simply to allow water to drain out. The actual size doesn't make a difference, except that water drains faster thru a larger hole. RNGR2

Early OpRods didn't have a hole on the end.
 

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The hole at the forward end of the operating rod is a vent hole. The hole in the bottom of the stock forward of the sling swivel is a drain hole.

The factory operating rod on my 1984 vintage select fire SAI M1A has an enlarged vent hole as well. It's a commercial manufacture operating rod. It has not affected function of my rifle in semi-automatic or automatic fire.
 
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