Quoted: Shamayim, thank you for the wonderful explanation. It raises 4 other questions:
1. Can you use a hammer WITHOUT a notch together with a bolt that has a cutaway?
2. Can you use a hammer WITH a notch together with a bolt that has a no cutaway ( a shrouded firing pin)?
3. Lastly, a purely academic gunsmithing inquiry, as there is neither an opportunity nor an inclination to conduct a test to determine the answer for myself. Legal ramifications aside,
A. if the disconnector is removed in a lower that has a hammer WITHOUT a notch and a bolt WITHOUT a cutaway, will the AR fire full auto?
B. if the disconnector is removed in a lower that has a hammer WITH a notch and a bolt WITH a cutaway, will the AR fire full auto?
Thank you.
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OK, let's see if I can give you coherent answers.
Questions 1) and 2). Yes to both. In fact; one of my own ARa has a 2) setup right now.
Question A: Generally speaking, you will NOT get full auto. What you will get is a round fired, and the hammer down on the next round in the chamber. It should be noted though, that if you're using commercial ammo intended for use in bolt actions, that has softer primers, you may OCCASIONALLY get a double or possibly a triple fire, before the hammer ends up down on a live round. I've heard of such, though many years ago when I tried it with my own class 3d AR, I was not able to duplicate it. I was, however, using 5.56mm ammo, meant for the AR and M16, that has the harder primer.
Question B: No. And that's what the notch and cutaway was all about. What you'll get is the bolt/carrier assembly stuck about 2/3 of the way closed, with the notch on the hammer caught on the firing pin collar.
Hope the above is understandable