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Basic
  • Joined Sep 2001
  • Posts 4520
  • Location USA LA, USA
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Basic
  • Joined Sep 2001
  • Posts 4520
  • Location USA LA, USA
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Posted: 5/14/2013 4:13:29 PM EST
I just got a H3 buffer for a 9mm build. The thing rattles. Is this normal?
I am thinking of jamming lead in there to get rid of the rattle. Either that or silicon .
Independent Field Tester /R & D
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Gold
  • Joined Jan 2006
  • Posts 15360
  • Location USA IN, USA
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Gold
  • Joined Jan 2006
  • Posts 15360
  • Location USA IN, USA
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Posted: 5/14/2013 4:26:44 PM EST
[Last Edit: 5/14/2013 4:27:18 PM EST by shadowcop]
H3 has weights. Yes it will rattle.
If you don't like it, I will trade you a 9mm buffer for it.
No rattle.
Dave N
"Better to die for something than live for nothing"

Basic
  • Joined Sep 2001
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Basic
  • Joined Sep 2001
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  • Location USA LA, USA
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Posted: 5/14/2013 4:58:43 PM EST
Originally Posted By shadowcop:
H3 has weights. Yes it will rattle.
If you don't like it, I will trade you a 9mm buffer for it.
No rattle.
Dave N


Thanks for the offer. I will just go with the H3 and if I can here the rattle shooting with a can I may take you up on it.
May be a while since I can not find a 9mm bolt.

“Whoa camel! Whoa!”
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  • Joined Nov 2000
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Bronze
  • Joined Nov 2000
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  • Location USA GA, USA
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NRA
Posted: 5/14/2013 6:07:07 PM EST
In my own industries' jargon - "that's not a bug, it's a feature."

The rattle is there on purpose - the weights freely slide forwards and backwards a small amount. During cycling, as the bolt finishes moving forward and strikes the barrel, it will have a tendency to want to bounce backwards off the barrel momentarily (physics being what it is and all). During full auto fire (or rapid semi-auto fire), this bouncing can cause stoppages if it overcomes the force of the recoil spring. The sliding weights help to counteract this - about the time the bolt hits the barrel and begins to rebound, the sliding weights will reach the forward-most point in their travel inside the buffer, slamming into the front portion of the buffer. That in turn causes the buffer to transfer a little extra "oomph" forward into the bolt, usually nullifying the bounce-back.

Hope that helps,

-bob
Formerly Raeth on the forums. See this thread:
http://www.ar15.com/forums/t_8_35/501006_What_should_I_do___old_or_current_arfcom_account_.html
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