OK, you and I are obviously speaking two different languages.
The MP5 link you posted to has a RECEIVER with three holes. The LOWER only utilizes two of those three holes. The LOWER is NOT a 3 pin lower, as it can only hold two pins at a time.
A factory G3 has a 3 pin LOWER. One in the front and two in the back. It uses 3 pins simlutaneously when attached to the receiver.
A clipped and pinned MP5 lower uses only 1 pin, but is made to look like it uses two. A clipped and pinned G3 lower uses the two pins in the back, but the one in front is false.
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