Close-up of the lower. The black thingy in the middle is SIG's version of the Accuwedge, but MUCH better. When you press down on it really hard it springs back up b/c it is spring loaded.
Close-up of the Upper. You can see the part of the piston rod that strikes the Bolt Carrier. It is rounded at the end and fits in the rounded "pocket" of the "carrier key".
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