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AR15.COM
3/17/2014 4:59:30 AM EDT
Forgive my poor description and lack of knowledge on this but  I just noticed that colt may have changed their lower receiver ever so slightly.  On one 6920 I have,  there is an oval shaped mark directly next to the safety selector but on a brand new 6920 it is squarish. Any ideas? When looking through pics I have seen plenty with the oval shape but not the square. What is that oval shaped thing properly called?   Thanks
3/17/2014 10:00:04 AM EDT
[#1]
If it's what I think you're referring to, those are where safety-selector stop lugs are on full-auto rifles.
On semi-auto rifles the lugs are not necessary and are removed during manufacture leaving a slight mark.
3/17/2014 10:01:23 AM EDT
[#2]
Yes that is it.   Any idea why they changed the shape?