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Piston/op rod alignment

This is a discussion on Piston/op rod alignment within the Modern M14 forums, part of the M14 M1A Forum category; What would you consider perfect or optimal op rod/gas piston/cylinder alignment? If you have pictures, that would be great....


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  • 2 Post By KurtC
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Old May 4th, 2020, 10:31 AM   #1
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Piston/op rod alignment

What would you consider perfect or optimal op rod/gas piston/cylinder alignment? If you have pictures, that would be great.

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Old May 4th, 2020, 11:08 AM   #2
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There is only one "center."

You don't have any control over the vertical alignment, only the lateral.

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Old May 4th, 2020, 01:09 PM   #3
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A lot depends on the op rod. Most are not exactly true. Adjustments can be made to the op rod guide to compensate, but note what KurtC said.

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Old May 5th, 2020, 07:17 PM   #4
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I’m no professional but if the two are making full contact, whether perfectly centered or not, you should be fine.

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Old May 6th, 2020, 10:21 AM   #5
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Off center contact between the op rod and piston imparts stresses on the op rod that can result in distortion and have a detrimental effect on accuracy. The rifle may still function adequately, but not perfectly. Not a big issue in a battle rifle. It is however an issue in a match grade rifle.

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Old May 6th, 2020, 10:55 AM   #6
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^^^What Ted said^^^

The rifle is designed to continue functioning with a lost oprod guide pin, with just the USGI stock holding it in place.

However, a misaligned oprod will put excessive wear on the tab.

Keeping everything aligned and running straight is one reason a recommend a National Match style spring guide, for all but the filthiest of conditions.

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Old May 6th, 2020, 12:32 PM   #7
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Some people go as far as lapping the contact area.




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