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Posted: 2/13/2015 2:06:34 AM EDT
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I want to know how far down the buffer tube does the buffer travel when fired? I'm aware this will vary depending upon spring weight and buffer weight.
But does the buffer USUALLY travel the entire distance of the buffer tube and bottom out at the end? Does it travel 3/4 of the way down the tube? Does it only travel 1/2 way? |
| This topic is relevant to my interests. I believe it is supposed to bottom out, or come close, otherwise there wouldn't be a bumper on there. I CAN tell you the buffer on my aero .308 build bottoms out, or at least did. I had one of the .308 carbine buffer/tube combos from Brownells on there and noticed the other day when cleaning that the BCG was hitting the receiver extension threads while cycling. Replaced with slashes heavy buffer that is about 1/8" longer than the Brownells. That 1/8" is just enough to reduce travel and keep the BCG from hitting the threads. Haven't shot it yet, but pretty sure this is going to fix the problem. |
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Quoted:
No, it should not bottom out but should come very close. Wrong. If it's not making some kind of contact with the back of the buffer tube, the bolt isn't going to reliably lock back on the last round, and you will probably have feeding problems where the bolt returns forward without properly stripping a round from the magazine. Any amount of fouling will cause the gun to short-cycle and stop working. That said, it shouldn't be vigorously beating the back of the buffer tube, either. There's a happy medium to be found where the action cycles reliably,but not so violently that it's increasing felt recoil unnecessarily. |
| That rubber dealie on the end of the buffer? It is SUPPOSED to bottom out in the receiver extension. Maybe not enough to squish it, but it should definitely be able to touch. The rubber part is actually one of several components that moderate carrier speed and movement. |
Thank you gentlemen, what was the information I was looking for. I was interested in manufacturing a delrin sleeve that slipped over the last 4-5 inches of the buffer spring to keep it from having any side to side play thus eliminating any rattle it has when shaken from side to side and essentially "silencing" it. But it doesn't like that is possible knowing that the buffer travels the full length of the tube. Thanks 
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The "twang" during action movement comes from the spring rubbing against the inside of the receiver extension. Application of some grease to the spring helps a lot to kill the sound. Dupont makes a Teflon dry film lube spray that may work also. use a metal ruler or calipers to depress the buffer and measure how much travel it has in the extension. Measured travel - charging handle travel = free space at the back of the extension. There's not much clearance between the face of the buffer and the ID of the tube. I would not recommend sticking any insert in there that is not bonded to the inside of the tube. A thin piece of teflon could always snag the corner of the buffer and once an edge is raised the buffer will keep peeling it. Eventually the insert will get bunched at the back of the extension and jam the buffer or limit the travel of the BCG. --- Just grease the spring. |
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Quoted:
Thank you gentlemen, what was the information I was looking for. I was interested in manufacturing a delrin sleeve that slipped over the last 4-5 inches of the buffer spring to keep it from having any side to side play thus eliminating any rattle it has when shaken from side to side and essentially "silencing" it. But it doesn't like that is possible knowing that the buffer travels the full length of the tube. Thanks Look at JP silent capture spring. http://www.jprifles.com/1.4.7.2_os.php I have them in all my suppressed ar15s. They eliminate any spring noise and actually my guns seem to run smoother. |
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Quoted:
Thank you gentlemen, what was the information I was looking for. I was interested in manufacturing a delrin sleeve that slipped over the last 4-5 inches of the buffer spring to keep it from having any side to side play thus eliminating any rattle it has when shaken from side to side and essentially "silencing" it. But it doesn't like that is possible knowing that the buffer travels the full length of the tube. Thanks Unnecessary. If you will lightly grease or oil the spring it will stop the "Sproing" sound. |
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