I am not 100% sure the correct way to measure an e-clip, but do the attached pics give you what you need?

 

Thanks, but I’m asking about the trigger to action pin clips. If my memory serves me I think he said 2mm. Hoping someone could verify.

 

How about this? The action is sitting on my bench at the moment so no issue to provide any info.

 

Thanks, that helps. So maybe the clip groove is 2mm.

 

You could probably find one at Harbor Freight. I have their clip assortment. Has come in real handy several times. $6.99.