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Well, I found 2 oprod spring guides in my parts box, one ventilated, one grooved. There are no markings on either side.





Both have the same dimensions. One early, one late?

Thoughts anyone...

Bruce
 

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The early ones were grooved (fluted). It is my understanding that the slotted version allows for an even dispersion of dirt, debris, water, etc, to keep the spring from binding.

Both seem to work just fine in the civilian world, but if you were doing a T44E4 build a grooved one is probably correct.
 
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