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AR15.COM
11/14/2012 5:29:58 AM EDT
I modified my M3 RDS to make the OFF position on the rheostat more visible. I simply took a file and lightly flattened one of the ridges on the knob where it aligned with the silver dot to make it easier to see that the RDS is off.

11/14/2012 6:10:31 AM EDT
[#1]
Funny cause I did the same thing yesterday with a paint pen. Helps you see if it's actually off much better.
11/14/2012 8:13:23 AM EDT
[#2]
I had used a sliver Sharpie several times but it kept wearing off. Now I have a permanent index mark.