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Posted: 5/27/2007 3:02:35 PM EDT
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I went shooting today with my 3 newly built lowers and ONE upper. After I got home I looked at each of my lowers, and they all had this problem in the pictures. It looks like it is chipped by the buffer retainer pin. There is also a crescent shaped line chipped out like something is digging in. When I put the upper/lower together, the bcg pushes back on the buffer just a little bit (maybe 1-2mm), is that normal? The pictures of are 2 different lowers, the other one is the same. The marks look like they are in the same spot. This is happening on all 3 lowers with a CAA 6 position collapsible stock. Any ideas? Thanks Eric  
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both as when an ar is closed the buffer does not touch the retainer pin. You dont need a retainer pin for an ar to function. It is only ther to make takedown easy. edit: on your lower pic, can you turn the buffer tube in one more revoultion? It looks like it is not turned in enough. |
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I checked the back of the carrier before I did anything, and didn't see/feel any burr or anything. After you guys kept pointing this out, I did a closer inspection and realized that there was a small shiny point where the carrier is cut for the retainer pin. I took some sandpaper and smoothed out the edges then dremeled it with a polishing tip. Then I pulled the charge handle back, held the bolt catch back, then let her slam home about 10 times. I saw no marks. Is this a case closed? Did this solve the problem, because the marks usually happen when the bolt slams home after catching a round right? thanks |
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