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Posted: 11/19/2008 11:15:29 AM EDT
I took apart my AR for the first time and am wondering if it matters the direction the lugs on the bolt are before I put it into the bolt carrier group. It seems if I twist it 180 before setting the retaining pin it could make a huge difference.
Link Posted: 11/19/2008 11:16:28 AM EDT
Yes the ejector has to go away from the port.
Link Posted: 11/19/2008 11:18:35 AM EDT
[Last Edit: 11/19/2008 11:19:28 AM EDT by Captains1911]
With both of mine, the cam pin (you said retaining pin but I assume you meant this) will only go into the bolt from one side. As someone else said, the ejector should be away from the ejection port and the extractor should be adjacent to the port.
Link Posted: 11/19/2008 11:20:18 AM EDT
Originally Posted By 80sgyrene:
Yes the ejector has to go away from the port.


So when I reassemble and the bolt is inside the rifle and I look through the ejection port, the ejector should be infornt of me or not visible?
Link Posted: 11/19/2008 11:23:21 AM EDT
[Last Edit: 11/19/2008 11:24:31 AM EDT by Captains1911]
Originally Posted By Waveridr85:
Originally Posted By 80sgyrene:
Yes the ejector has to go away from the port.


So when I reassemble and the bolt is inside the rifle and I look through the ejection port, the ejector should be infornt of me or not visible?


The ejector should be visible, but across the bolt (on the left side of the gun), on the opposite side of the ejection port.
Link Posted: 11/19/2008 11:24:56 AM EDT
[Last Edit: 11/19/2008 11:25:26 AM EDT by M-Dub]
Originally Posted By Waveridr85:
Originally Posted By 80sgyrene:
Yes the ejector has to go away from the port.


So when I reassemble and the bolt is inside the rifle and I look through the ejection port, the ejector should be infornt of me or not visible?


If you stop and think about how the rifle works, mechanically, it should become apparent. That's what I do.

Think about how the ejector works. It's that little pin on the bolt face that pushes the cartridge up and off to the side.

Put the bolt in so that when the ejector pushes the cartridge out, it tilts it up and out of the ejection port. To do so, the ejector will have to be on the side OPPOSITE the ejection port. The extractor claw, on the other hand will be facing toward the ejection port.



Link Posted: 11/19/2008 11:27:00 AM EDT
Now I'm curious, what make of AR do you have, and does the bolt allow the cam pin to go in from either side?
Link Posted: 11/19/2008 11:28:33 AM EDT
As already stated. The cam pin will only go in one way, the right way. You can't assemble the bolt into the carrier incorrectly. Line up the cam pin hole on the bolt with the hole in the carrier. If the cam pin won't go in, the bolt is 180 out.
Link Posted: 11/19/2008 11:31:08 AM EDT
Originally Posted By Captains1911:
Now I'm curious, what make of AR do you have, and does the bolt allow the cam pin to go in from either side?


Your absolutely right guys. I put the rifle together and when i was looking back i wondered if i made a mistake. Now that i take it apart, the cam pin will only go in one way. Thanks a ton for your help.
Link Posted: 11/19/2008 5:33:33 PM EDT
Think about the mechanics for a minute. It really is a simple design.
Link Posted: 11/19/2008 5:40:44 PM EDT
[Last Edit: 11/20/2008 4:34:09 AM EDT by MMcfpd]
It ought to be like this when assembled correctly:


ETA - People have reported getting poorly machined cam pins bolts* that allowed them to install the bolt 180° out. I imagine that's good for one shot, after which the ejector tries to send the casing out where there's no ejection port.

* corrected after I realized what I'd said wrong
Link Posted: 11/20/2008 2:17:17 AM EDT
Originally Posted By Captains1911:
With both of mine, the cam pin (you said retaining pin but I assume you meant this) will only go into the bolt from one side.


If it's a milspec bolt, but there are some cheap ass commercial pieces out there that you can insert the pin on either end. I once had a Rock River bolt (for about 2 weeks) that you could do that with. Since then I use nothing but Colt bolts.

Link Posted: 11/20/2008 5:54:00 AM EDT
One little trick kinda off subject, but you can mark the front of the cam pin forward edge with a line so you will always put it in the same way and it will wear the same side. This really is not necessary, but it allows exact reassembly wear.
Link Posted: 11/20/2008 12:01:30 PM EDT
Don't know if I'm remembering wrong, but I thought my USMC Colt M-16A1 could have the cam inserted with the bolt 180 degrees out. (20 + years ago so I'm not sure)
Link Posted: 11/20/2008 12:08:29 PM EDT
Originally Posted By MMcfpd:
It ought to be like this when assembled correctly:
http://i150.photobucket.com/albums/s95/MMcfpd/762x39_AR_bolt_ready.jpg

ETA - People have reported getting poorly machined cam pins bolts* that allowed them to install the bolt 180° out. I imagine that's good for one shot, after which the ejector tries to send the casing out where there's no ejection port.

* corrected after I realized what I'd said wrong


+1
Link Posted: 11/20/2008 1:00:14 PM EDT
That is one clean bolt. I better get out the CLP.
Link Posted: 11/20/2008 1:46:28 PM EDT
Originally Posted By Waveridr85:
Originally Posted By Captains1911:
Now I'm curious, what make of AR do you have, and does the bolt allow the cam pin to go in from either side?


Your absolutely right guys. I put the rifle together and when i was looking back i wondered if i made a mistake. Now that i take it apart, the cam pin will only go in one way. Thanks a ton for your help.


Don't worry we all had to learn!

Link Posted: 11/20/2008 2:03:12 PM EDT
I always look into the bolt carrier with the bolt installed and look for those depressions on either side of the hole.
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