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Posted: 9/21/2013 8:52:48 PM EDT
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I want to know how I can solve this problem of my buffer hitting the buffer detent spring/pin. I have a lower that I milled out, so I am assuming that it was not within specs... What are my options to fix this problem? Can I just remove the detent spring and pin?
This is on my Grendel with a standard length and standard buffer tube, spring, and buffer. Can I file down the buffer tube a bit to make it fit better? Here is the link to my pics, couldn't get the pics to post here. http://forum.snipershide.com/snipers-hide-semi-auto-rifles/211647-buffer-damage-help.html |
| The pin is supposed to hold the buffer in place; so that when the upper is separated from the lower, the buffer does not shoot out of the lower receiver extension. When the upper is pinned to the lower, the bolt carrier group pushes the buffer off of the pin to prevent it from striking the pin when the weapon cycles. |
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Take them out and then catch them before they shoot out when you take the gun apart.
I don't know if this could work but what if the OP cemented an aluminum pin to take up the hole and then re-drilled the hole? Likely the OP would drill partly into the pin as well as the receiver but if the cement held, would this be a possibility? It isn't like it's a load bearing area or anything. |
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The BCG is suppose to slightly push the buffer off the pin when the upper and lower are put together. It sounds like yours is not doing this and the buffer is slamming into the pin when the BCG returns home. Like has been said you can just remove the pin if you like, that would probably be the easiest thing to do. It's only there to keep the buffer from shooting out of the tube when you separate the upper and lower, you'll just have to remember to catch it when you pull it apart.
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http://www.brownells.com/rifle-parts/stock-forend-parts/recoil-parts/recoil-buffers/ar-15-m16-ar-style-308-buffer-pad-prod19699.aspx This will work if you trim the pad so that it clears the pin. The pad should be thick enough to allow the carrier to push back on the buffer so that it no longer hits up against the pin. Or, you could cut your own piece of delrin or plastic to fit and glue it on the end of the buffer. |
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Quoted:
http://www.brownells.com/rifle-parts/stock-forend-parts/recoil-parts/recoil-buffers/ar-15-m16-ar-style-308-buffer-pad-prod19699.aspx This will work if you trim the pad so that it clears the pin. The pad should be thick enough to allow the carrier to push back on the buffer so that it no longer hits up against the pin. Or, you could cut your own piece of delrin or plastic to fit and glue it on the end of the buffer. No, no, and no since the pad only cause more problems instead. If the depth of the receiver extension is correct, then adding a pad to the face of the buffer is only going to cause the problem on the bolt face not coming back far enough to be retained by the bolt catch. Worse yet, since the location of the buffer retainer pin was milled too far rearward in the receiver to begin with, the face of the buffer with pad now is still going to crash into the pin tip every stroke, ending with the tip of the retainer cracked as well. As for if the receiver is made of 7075, then welding is out to fill the channel back in, so the next solution would be to make an over size buffer retainer, and then re-mill the retainer channel larger more forward to solve the problem instead (use the back wall of the existing channel as the start point for the larger channel to fit the larger buffer retaining pin, which will put the new center of pin post to the correct position in the receiver). |
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removing is probably the cheapest.
other "solution" to review... used to own an RGuns lower I modified the buffer.. it worked, just no interchanging of buffers though, each one had to be machined. http://www.ar15.com/forums/t_3_66/524295_.html ultimate solution is up to you. |
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Quoted:
Fill the hole with JB weld. Redrill in correct position. Problem is, chances are the channel was off drilled just a few thousands, and will end up with just a touch of the JB weld after the new channel is drilled, which the JB weld will not hold. The over size buffer retainer pin would be a better choice, since you don't end up with a filler only a few thousands of a inch that may not hold to the receiver wall (plus the heat generated when the new channel is milled is going to break the bond of the JB weld to the side wall of the existing channel). |
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I had a lower that the buffer retainer pin was off.I used one of the carrier weight systems(without the weights in the sleeve) to get the buffer back off the retainer.This is a bandaid fix but worked for several years.
Not sure how far your off,may or may not work for you. Its an idea anyway. http://www.brownells.com/rifle-parts/bolt-parts/bolt-carrier-parts/bolt-carrier-hardware/ar-15-carrier-weight-system-prod12720.aspx |
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Quoted:
removing is probably the cheapest. other "solution" to review... used to own an RGuns lower I modified the buffer.. it worked, just no interchanging of buffers though, each one had to be machined. http://www.ar15.com/forums/t_3_66/524295_.html ultimate solution is up to you. I was just about to suggest your fix to the OP. Good job on a brilliantly simple fix! |
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