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Posted: 1/21/2009 2:10:28 PM EDT
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Okay so I am threading a Stag Mil-spec buffer tube into a quality lower and when it gets to the buffer retainer pin at the proper orientation there is only about 0.020-0.030" overlap of the buffer tube over the pin to hold it down. Not much overlap in my opinion, especially since the buffer and spring will be pushing the retainer pin to the far side of the hole when installed. Screwing the buffer tube in another full 360 degrees for more engagement over the retainer pin results in the buffer tube binding the pin movement. Also at this point the buffer tube almost sticks out of the threads inside of the lower. May have to file it a bit so that it does not interfere with the upper installation.
What to do? Live with the minimal overlap? Or file a notch in the buffer tube so the retainer pin does not bind? Thanks, knikshooter |
| I don't actually have an AR yet (still waiting on parts), but, FWIW, I was under the impression that the buffer retainer really didn't have to move at all. If that's the case, could you not just install the buffer, then tighten the tube another 360 for full coverage of the retainer? |
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FWIW, I had to file down the one side that would hit the buffer retaining pin first, then rotate to the notch. Too much non-threaded material on the end of the buffer. If it interfeers w/the upper when you close, both sides of the notch would need trimmed.
Does sound as though you may need to deepen the notch also. |
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This may sound crazy but IMO take the pin assembly out and measure how much the tube travels up the threads when you perform a 360 rotation. Then calculate how much you have to take off the threaded end of the tube.
IMO dont make a notch, just take off what you need from the threaded end nice and square. Not sure if there are any glaring errors with this please correct me or enlighten me as to why not just hack some off the whole end of the tube. |
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Quoted:
When it is screwed in this additional rotation does it interfere with closing the upper onto the lower? Thanks for the responses, I don't have my upper yet to check, but it will be very close. The receiver extension looks to be about flush with the inside of the threaded ring of the lower. Of course the best fit of the buffer tu.. I mean receiver extension to the buffer retainer pin is when it is 180 degrees out and upside down. I guess a little careful filing of the receiver extension is in order, as I don't trust the minimal engagement of it at first contact with the retainer pin. This forum is great, I have learned a lot and have even struck buffer tube from my vocabulary. Didn't know that was a no no in AR terminolgy. Now if I could just find me a few more of those Pmag clips. 
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