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Posted: 1/4/2010 4:50:25 PM EDT
 I have just done my first M-16 conversion. I was unable to find truly detailed instructions so I just machined as it appeared to need. I used GI parts. From what I can tell the left side auto sear spring rests on the selector. When the selector is moved the spring rides in and out on the selector causing friction that may wear through in time. Is the spring intended to rest on the selector?? Otherwise the conversion works flawlessly.
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Quoted:
From what I can tell the left side auto sear spring rests on the selector. When the selector is moved the spring rides in and out on the selector causing friction that may wear through in time. Is the spring intended to rest on the selector?? I don't have my M16 in front of me but I believe you can confirm if it is correctly set up by doing the following, with the upper taken off, set the selector to semi and you will notice that the sear is pointing straight up and it will not catch the hammer notch with the sear. Place it in the auto position and you will notice the sear tilt back slightly so it will catch the hammer notch and only release when the bolt is forward and locked into position. The friction you mention (to damage it) would require you to some how spin the selector switch at drill speeds, which won't happen. Also I am pretty sure the spring is intended to rest on the selector and the tilting back and forth is becaust of the notchs in the selector. HTH, and welcome to the AR15.com forums |
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Maybe this link will help ya out:
http://www.quarterbore.com/nfa/registeredreceiver.htm |
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Thanks for the input guys. I knew it would take a long time to wear thru, ( if it ever would). I was just sceptical that having the spring ride on the notches on the selector would have been the factory preferred resting place.
P.S. this is a great site. I think I'll hang out here more often. |
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Yep.
It stands for Class 3 Specialties. Im mostly interested in custom AOW's, suppressors, and SBR's to the public. Just getting started. I converted this lower to demonstrate a full auto AR57 to the local laws if their interested. Thanks for that tip on the groove. I'll pull that selector out and have a look. |
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Quoted:
Yep. It stands for Class 3 Specialties. Im mostly interested in custom AOW's, suppressors, and SBR's to the public. Just getting started. I converted this lower to demonstrate a full auto AR57 to the local laws if their interested. Thanks for that tip on the groove. I'll pull that selector out and have a look. How did you deal with bolt bounce / bulged cases etc? I've heard some stories about it so far, but not much success. J |
| I have yet to fire it. It's been 0 to 20 degrees outside since I registered the receiver. 57center sent a full auto buffer with the bolt. Im hoping they solved these problems before they sent me the bolt, (they did not advise me of any potential problems). If I get out tomorrow I'll post my results right away. |
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Quoted:
I have yet to fire it. It's been 0 to 20 degrees outside since I registered the receiver. 57center sent a full auto buffer with the bolt. Im hoping they solved these problems before they sent me the bolt, (they did not advise me of any potential problems). If I get out tomorrow I'll post my results right away. C3S: What's different with the buffer? The semi-auto buffer is just a heavy solid buffer. Did they specify a particular ammo to run with it? Musings in general: I think some sort of sliding weight or hydraulic buffer would help with the bounce issue. Maybe also something like the spikes 22 kits with a ball detent. I wonder how hard it would be to make an mp5ish locking bolt. It wouldn't need to lock it completely. |
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I ran 50 rounds thru it this afternoon. I fired 4 rounds semi for comparative purposes. Then switched to full and emptied the mag. No jams! As far as I can tell, there are no diffences in the spent cases. No bulging to indicate bolt bounce or out of battery firing. I would say that judging from the partial flatness of the primer and apparent gas that passed between the case and the chamber, this cartridge could be loaded up a bit more. This is, however, a 6" barrell with a suppressor. I'll try a 16" barrell and see if the case does'nt get more pressure.
I was useing SS197 ammo. I have some SS192 but did not think to take a box with me. The factory full auto buffer has an internal weight that slides back and forth seemingly simulating a "dead blow" hammer. This is my first experience with an AR57. It worked flawlessly. Next time I go out I'll take my PS90 and compare it's spent cases. |
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