AR15 vs M4/M16 -- The mechanical difference

SC4006

New member
So for those of you who don't know, and are interested in what separates a civilian legal AR15 from a full auto capable M4/M16 from a mechanical standpoint, I thought I would post a cool video I found that shows pretty well the difference.

The video is HERE

I found this video while doing some research to try to find out for myself what makes them different as I am quite familiar with the M4 fun switch :D, but don't have an AR15 to compare the internals to.
 
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