AR 15 buffer damage... anybody seen this before?

Got it! But I was thinking more like 2 mm, not 5 mm. Anyways, I'd try it if it was me, but I'd still keep looking for a more permanent solution.

Maybe you are not familiar with the AR-15 platform, but what I'm saying is that trying it is a waste of time. You could cut the buffer in half and it will still push right up against that post. 2mm... 5mm... 3cm... wont make any difference in as far as stopping it from hitting the post.
 
You could cut the buffer in half and it will still push right up against that post. 2mm... 5mm... 3cm... wont make any difference in as far as stopping it from hitting the post.

Exactly. Either ship the lower back for a replacement (if in fact the buffer retaining pin is in the wrong spot) or just take the pin out and be careful when taking the upper off.
 
Why not just relief the face of the buffer a little until the necessary clearance for the retainer pin is obtained? Not the whole face of the buffer, but rather the part (ring) where the retainer pin contacts the buffer. Then the center of the buffer will be further forward and contact the rear of the carrier as it should, but the edge of the buffer's face will be a bit further back and won't be able to contact the pin. I know, it would have to be machined to make it precise, but it shouldn't be too hard, nor too expensive to do. Heck, with a buffer so battered, I'd dare to do it even with a Dremmel tool. What do you guys think?


i understand what you're getting at, and i think it would work...

you want me to cut a ring around the outside of the buffer a bit wider than the height of the retaining pin..

what i've done right now is basically the same idea.. i glued a piece of plastic onto the buffer.. its smaller in diameter than the buffer...

its the same idea except i added plastic instead of taking off metal..

it looks like its working so far.. i can see the buffer being pushed in by the carrier when i close the upper on to the lower.
 
i understand what you're getting at, and i think it would work...

you want me to cut a ring around the outside of the buffer a bit wider than the height of the retaining pin..

what i've done right now is basically the same idea.. i glued a piece of plastic onto the buffer.. its smaller in diameter than the buffer...

its the same idea except i added plastic instead of taking off metal..

it looks like its working so far.. i can see the buffer being pushed in by the carrier when i close the upper on to the lower.

Exactly!

I still think you'll have to find out what is wrong and get it corrected, but at least you won't be hammering the pin in the meantime.
 
Somewhat hard to believe, I'm beginning to think there's nothing other than the retainer pin hole being drilled too far back on that lower. It doesn't take very much distance for the buffer to contact the retaining pin. Aside from a short, or out of spec carrier, there's nothing else in line to cause this damage unless there's some form of "stacking" happening.
 
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I dont think the hole is drilled too far back.. i believe it has to do with the gap between the upper and lower...

the fit along the horizontal is nice and tight, but along the back there's a a bit of a gap.. about the same width as half of the buffer retainer...

i think because of this gap, the carrier is not making contact with the buffer and this is why the buffer is hitting the pin causing the damage..

i think, (and i could be totally out to lunch) that the large to small hole adapter that i used in the front is keeping the upper a little too far forward..

below is the fix for now.. i glued a piece of hard plastic to the buffer..
i opted for plastic as my carrier is not damaged at all and i'd like to keep it that way...

tomorrow is the trip to the range to test.




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OK then, we're done. :) Like someone said earlier, "So parts that were never intended to be used together are not working well."
 
You could also make a new retainer with a forward positioned pin. The main diameter of the pin is 1/4" while the hole inside is 3/16". Not too difficult, even with handtools.

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