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Posted: 12/21/2010 4:40:05 AM EDT
| I've got a mil spec buffer tube on my rifle and I'm having a slight problem with it. I got it in and everything functions, but the leading edge of the buffer sticks out past the threads of the receiver. When I try to mate the upper, it binds on this edge and I can't get it to fully seat into the lower. My temporary fix was that I backed the buffer tube out 1 turn, but not it's sloppy and loose when gripping by the stock. I can twist it back and forth about 1/8". If I twist it back in, then everything is nice and tight, but I can't get the upper to fall into the lower. I guess I need to grind/polish off some of the tube on the threaded end? What's the best way to go about that if that is indeed what I need to do? |
| Is this your first time installing a stock? It sounds to me like you've threaded the tube all the way into the lower re receiver which you're not supposed to do. I didn't hear you mention anytying about a buffer retainer/spring, endplate, or castle nut. The tube only needs to be threaded in far enough to prevent the buffer retainer from popping out.....at which point you tighten down the castle nut/endplate to secure it. Try posting a pic or two to give us a better idea of the problem you're having. |
| Yes, first time installing a stock. It's my first build. I have the endplate/buffer/spring/castle nut and everything on there. It's a collapsable Magpul CTR stock. When threaded in so that it butts up nicely to the buffer retainer pin, that's when the upper receiver contacts the tube. When I back it out one turn, it still holds the retainer pin in place, but it's not snugged up against it. I suppose it's possible that I don't have the castle nut tight enough. I'll see if I can get some pics up after work I guess. |
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It shouldn't contact the center of the pin or "butt up against it"....it should hold the pin in place, but not bind its movement.
see here |
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Quoted:
It shouldn't contact the center of the pin or "butt up against it"....it should hold the pin in place, but not bind its movement. see here Thanks for the good link with pictures. However, my buffer tube doesn't look like that one. Mine has a notch in it that fits around the pin. Either way I guess it's the same idea of not touching the actual post on the pin. If that's the case, do do you think I just don't have the castle nut tight enough? |
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Quoted:
Quoted:
It shouldn't contact the center of the pin or "butt up against it"....it should hold the pin in place, but not bind its movement. see here Thanks for the good link with pictures. However, my buffer tube doesn't look like that one. Mine has a notch in it that fits around the pin. Either way I guess it's the same idea of not touching the actual post on the pin. If that's the case, do do you think I just don't have the castle nut tight enough? This. as others have stated... your extension should JUST be holding that retainer in. what you do is this... put a plastc bag around it (to catch it if and when it flies).... and then smack your stock against the ground a few times... don't be gentle with it.... you will see that the retainer will still be there and be satisfied that it is on there enough. Keep in mind there IS a torque value associated with the castle nut... i BELIEVE...don't quote me... that it is 40 inch lbs. but 9 times out of ten no one pays attention to that particular torque value and never has any problems... i don't myself... i just torque it tight as im comfortable with... then a tiny bit more... Stake your endplate. |
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Quoted:
I've got a mil spec buffer tube on my rifle and I'm having a slight problem with it. I got it in and everything functions, but the leading edge of the buffer sticks out past the threads of the receiver. When I try to mate the upper, it binds on this edge and I can't get it to fully seat into the lower. My temporary fix was that I backed the buffer tube out 1 turn, but not it's sloppy and loose when gripping by the stock. I can twist it back and forth about 1/8". If I twist it back in, then everything is nice and tight, but I can't get the upper to fall into the lower. I guess I need to grind/polish off some of the tube on the threaded end? What's the best way to go about that if that is indeed what I need to do? where is your buffer retention pin? this same pin should keep your buffer from screwing in too far. |
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i cannot count the time where my castle nut came loose.
it's one of the parts that HAS to be staked. i have done a bad stake job on my stuff.. but still.. it holds the nut in place now. :) Quoted:
Quoted:
Quoted:
It shouldn't contact the center of the pin or "butt up against it"....it should hold the pin in place, but not bind its movement. see here Thanks for the good link with pictures. However, my buffer tube doesn't look like that one. Mine has a notch in it that fits around the pin. Either way I guess it's the same idea of not touching the actual post on the pin. If that's the case, do do you think I just don't have the castle nut tight enough? This. as others have stated... your extension should JUST be holding that retainer in. what you do is this... put a plastc bag around it (to catch it if and when it flies).... and then smack your stock against the ground a few times... don't be gentle with it.... you will see that the retainer will still be there and be satisfied that it is on there enough. Keep in mind there IS a torque value associated with the castle nut... i BELIEVE...don't quote me... that it is 40 inch lbs. but 9 times out of ten no one pays attention to that particular torque value and never has any problems... i don't myself... i just torque it tight as im comfortable with... then a tiny bit more... Stake your endplate. |
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Quoted:
Quoted:
I've got a mil spec buffer tube on my rifle and I'm having a slight problem with it. I got it in and everything functions, but the leading edge of the buffer sticks out past the threads of the receiver. When I try to mate the upper, it binds on this edge and I can't get it to fully seat into the lower. My temporary fix was that I backed the buffer tube out 1 turn, but not it's sloppy and loose when gripping by the stock. I can twist it back and forth about 1/8". If I twist it back in, then everything is nice and tight, but I can't get the upper to fall into the lower. I guess I need to grind/polish off some of the tube on the threaded end? What's the best way to go about that if that is indeed what I need to do? where is your buffer retention pin? this same pin should keep your buffer from screwing in too far. The buffer retention pin is right where it's supposed to be. |
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i must be missing something... post us a photo of your buffer tube?
Quoted:
Quoted:
Quoted:
I've got a mil spec buffer tube on my rifle and I'm having a slight problem with it. I got it in and everything functions, but the leading edge of the buffer sticks out past the threads of the receiver. When I try to mate the upper, it binds on this edge and I can't get it to fully seat into the lower. My temporary fix was that I backed the buffer tube out 1 turn, but not it's sloppy and loose when gripping by the stock. I can twist it back and forth about 1/8". If I twist it back in, then everything is nice and tight, but I can't get the upper to fall into the lower. I guess I need to grind/polish off some of the tube on the threaded end? What's the best way to go about that if that is indeed what I need to do? where is your buffer retention pin? this same pin should keep your buffer from screwing in too far. The buffer retention pin is right where it's supposed to be. |
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