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Posted: 4/18/2010 9:46:10 PM EDT
| I just completed my first build. Spike lower, spikes milspec btube and STT2 buffer on DSA upper. I am getting light marks on buffer enough to take off black and mar buffer. I have detent about as far down as it can go. Since the marks are light I wondering if I just put one of the plastic buffer protectors on it and call it a day. I compared set up of detent on my other two ar's and they are excatly the same. From searching archives I understand the detent hole might be to far back. Since it's minimal thought the best way to go would be the protector? Thanks for advice |
| theres a real easy way to check if it is actually being caused by the detent. pull your rear takedown pin and pivot the upper. then slowly pivot the upper back down and observe whether or not the back of your bolt carrier pushes the buffer back off the detent. you might be surprised. |
| If you can eliminate the detent as the problem check the rear of the carrier for a burr or debris (sand, metal, etc.). A small burr will cause the marks in a circular pattern on the buffer face and sometimes vertical scratches as the buffer slides across the rear of the the carrier when you open and close the weapon. |
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its the detent, positive on that. the bolt carrier doesnt push it off detent completly. I was guna mike distances on the spikes lower compared to my others but havent had time and if it wasnt a hughe deal I wasnt going to bother. I just hate to ruin a buffer after paying what I paid for it.
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yeah, i wouldn't like the thought of that either. and i wouldn't think that the detent is beefy enough to take that kind of punishment over and over. seems like its destined to cause a failure at some point.
ETA. since you're running an ST-T2 buffer, i'd be willing to bet that your buffer will be fine (aside from some marks). those things are built rock solid. its the detent i'd worry about. |
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When you close the upper onto the lower, the rear of the carrier should push the buffer a slight amount backwards so it no longer touches the detent.
The detent could be too far backwards, the carrier could be too short, or the mouth of the upper receiver too long(where the barrel extension meets the upper). A shim sounds like it would do it the trick, but it also sounds like a band aid. |
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Quoted:
When you close the upper onto the lower, the rear of the carrier should push the buffer a slight amount backwards so it no longer touches the detent. The detent could be too far backwards, the carrier could be too short, or the mouth of the upper receiver too long(where the barrel extension meets the upper). A shim sounds like it would do it the trick, but it also sounds like a band aid. read before you post? 
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