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M14 op rod question
- Thread starter RTH1800
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Re: M14 op rod question
If I recall correctly it's a drain hole to drain water if the rifle has been submerged.
If I recall correctly it's a drain hole to drain water if the rifle has been submerged.
Re: M14 op rod question
Two versions... vent/drain hole or locating hole for machining. Your choice.
Two versions... vent/drain hole or locating hole for machining. Your choice.
Re: M14 op rod question
It's a vent hole.
Reference: US government M14 Technical Data Package, Quality Assurance Provisions for part number 7267064, page 3 of 4, item no. 207.
It's a vent hole.
Reference: US government M14 Technical Data Package, Quality Assurance Provisions for part number 7267064, page 3 of 4, item no. 207.
Re: M14 op rod question
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: NoExpert</div><div class="ubbcode-body">What was/is the purpose of it? Mine is old, no vent hole. </div></div>
Harrington & Richardson Arms added the vent hole to its M14 operating rods beginning in 1961. Springfield Armory and Winchester did likewise after 1961. The vent hole on the forward end of the tube section was added to the operating rod drawing with Revision G dated September 29, 1960.
My guess is that the reciprocating action of the operating rod creates a very short-lived but cyclical and slightly higher air pressure inside the tube portion without the vent hole at the forward end. The vent hole ensures equal air pressure at all times between the inside and outside of the tube portion of the operating rod.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: NoExpert</div><div class="ubbcode-body">What was/is the purpose of it? Mine is old, no vent hole. </div></div>
Harrington & Richardson Arms added the vent hole to its M14 operating rods beginning in 1961. Springfield Armory and Winchester did likewise after 1961. The vent hole on the forward end of the tube section was added to the operating rod drawing with Revision G dated September 29, 1960.
My guess is that the reciprocating action of the operating rod creates a very short-lived but cyclical and slightly higher air pressure inside the tube portion without the vent hole at the forward end. The vent hole ensures equal air pressure at all times between the inside and outside of the tube portion of the operating rod.
Re: M14 op rod question
Interesting info.
I've read the op rod nose can hit some really high temps during rapid or full auto fire (makes sense with the piston contacting it). I wonder if it also serves to try to help cool the op rod nose when moving by using some of that air pressure...
Interesting info.
I've read the op rod nose can hit some really high temps during rapid or full auto fire (makes sense with the piston contacting it). I wonder if it also serves to try to help cool the op rod nose when moving by using some of that air pressure...
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