Below is a pic with the receiver screwed in place.
The recoil shoulder "ledge" is the lighter line in front of the receiver (with the green arrow pointing toward it).
It's in a hard place to measure, but it seems to stick out about 0.02".
I am wondering how this would affect the recoil lug to receiver fit and if it would induce an angle or adverse pressure/recoil when everything is tightened down...
Also, if I need to make it flush, I need to figure a way to shave it off without making a mess of the inletting and possibly after relieving it, to build it back up to bear straight, smooth & flush with the lug (using a little epoxy). IF it isn't a concern, I'll leave it as is...
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