AR15.Com Archives
 Buffer weight noise.
Turbolark  [Member]
12/3/2010 8:52:49 AM
Building my first Ar15.
Just got my box of goodies from Stag last night. Installed the A2 stock and the buffer.When i tip the gun i can hear the buffer tube extension slide a bit. Not a big deal as I can find a thin washer or just add a a few dabs of silicone.
The thing that bothers me is the sound of the weights moving back and forth in the buffer. This is a hunting gun, so the last thing i need is more potential noises. Can I pen the buffer and add something to hold the weights in place to quiet the sounds? If so, what would be recommended that can handle the heat it would get?

Thanks all.
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RDTCU  [Team Member]
12/3/2010 9:04:33 AM

Originally Posted By Turbolark:
Building my first Ar15.
Just got my box of goodies from Stag last night. Installed the A2 stock and the buffer.When i tip the gun i can hear the buffer tube extension slide a bit. Not a big deal as I can find a thin washer or just add a a few dabs of silicone.
The thing that bothers me is the sound of the weights moving back and forth in the buffer. This is a hunting gun, so the last thing i need is more potential noises. Can I pen the buffer and add something to hold the weights in place to quiet the sounds? If so, what would be recommended that can handle the heat it would get?

Thanks all.

Those weights are what eliminates bolt bounce.

You could use an Enidine Hydraulic buffer.

Or if you don't care about bolt bounce (can cause failure to fire or even out-of-battery discharge with rapid fire) you could replace the weights in the buffer with something solid by driving out the roll pin and pulling the poly plug out.

Or just stop tipping the rifle up and down repeatedly in the woods...
putiton11  [Member]
12/3/2010 10:57:28 AM
I believe spikes makes one with powder instead of weights
RDTCU  [Team Member]
12/3/2010 11:05:01 AM

Originally Posted By putiton11:
I believe spikes makes one with powder instead of weights

Do they make their powder buffer in rifle length or just carbine?

(He COULD get the carbine-buffer spacer/adapter and run a carbine spring/buffer in a rifle tube)
Gamma762  [Team Member]
12/3/2010 1:00:24 PM
The sliding weights are why it's a "buffer" and not just a spring guide.

If it's really a concern to you, could replace it with a 9mm buffer or one of the previously mentioned Enidine buffers.
Dano523  [Moderator]
12/3/2010 3:09:58 PM
Originally Posted By Turbolark:
Building my first Ar15.
Just got my box of goodies from Stag last night. Installed the A2 stock and the buffer.When i tip the gun i can hear the buffer tube extension slide a bit. Not a big deal as I can find a thin washer or just add a a few dabs of silicone.
The thing that bothers me is the sound of the weights moving back and forth in the buffer. This is a hunting gun, so the last thing i need is more potential noises. Can I pen the buffer and add something to hold the weights in place to quiet the sounds? If so, what would be recommended that can handle the heat it would get?

Thanks all.


For you, drive the buffer bumper roll pin out, pull the buffer bumper off, then using cotton cleaning patches, pack the three buffer weights solid in the tube and put the bumper and roll pin back in.

This will not change the mass of the buffer, but you will loose the reward stall of the B/C, so as your mag springs start to go weak, you may run into feeding problems as the mags don't recover fast enough. Also, the ejection path of the rifle will now be forward, so don't panic when the path changes. As for bolt bounce, you have a semi auto rig, so it's not a problem.
Turbolark  [Member]
12/3/2010 5:09:29 PM
Thanks all for the info.
I wont worry about it then. I didnt know that the weights were supposed to move like that. If it really starts to be an issue for me later I'll look into that hyd buffer.
ezlife45  [Member]
12/6/2010 9:37:30 PM
Also the only real heat the buffer may see is from the friction of moving back and forth.
jdoming728  [Member]
12/8/2010 1:21:43 PM
I like to use the Spikes units since it has Tungsten powder inside instead of moving or shifting weights....... But to some the noise dosent bother them.....
Gamma762  [Team Member]
12/8/2010 2:26:27 PM
Originally Posted By jdoming728:
I like to use the Spikes units since it has Tungsten powder inside instead of moving or shifting weights

Which defeats the buffering action.
RDTCU  [Team Member]
12/8/2010 2:55:14 PM

Originally Posted By Gamma762:
Originally Posted By jdoming728:
I like to use the Spikes units since it has Tungsten powder inside instead of moving or shifting weights

Which defeats the buffering action.

Not entirely. It still has a bit of give. Think of it acting like a solid chunk of rubber with the density of lead.
Big-Bore  [Team Member]
12/11/2010 10:09:38 PM
Tungsten powder works great. I needed to tune some rifle buffers on some wildcat rounds and I got the heavy tungsten powder from, who else, Tungsten Heavy Powder.com. I was able to increase the weight of an LR-308 rifle buffer by two ounces and an AR-15 rifle buffer by three ounces to move the ejection pattern to the correct position without having to resort to an adjustable gas tube or block, which would be difficult to do on these particular rifles and forends. The powder still shifts in the buffer and allows for the dead blow action eliminating bounce the same as with the standard type buffer internal weights and is a lot more adjustable. And while a pound of it is $50 it goes a long way.
techinny  [Member]
12/12/2010 2:31:42 PM
I am new to AR-15s, I recently bought a used Remington R-15 in .204 for varmint hunting. I have always wanted an AR and finally found a way to justify it. This noise the OP is talking about, would this be coming from the reciver area, (just ahead of the stock)? I also have a noise when the gun is tipped front to back, and being a mechanic, want to know what it is. I have shot it and it performs fine, no problems. I read the owners manual and disassembled the gun enough to make sure that the pin that if it is missing, the gun will blow up, was there, seeing as I bought it used. I have not disassembled it again to investigate the noise. Sorry for the long winded post
Big-Bore  [Team Member]
12/13/2010 9:41:34 AM
The noise the OP is talking about actually comes from inside the stock although it may sound like it is coming from up front when the rifle is tilted back and forth or shaken.
Inside the stock is the receiver extension (buffer tube) and inside it is the buffer spring and the buffer. Inside the buffer are several weights that are free to slide back and forth inside the buffer. That is what causes the dead-blow affect and reduces bounce unlike a solid buffer would cause and also causes a slight pause at the full back stroke of the BCG when fired.
If you open up your rifle and look into the receiver extension you will see the face of the buffer being held there by a pin. Depress the pin (it is captive and will not come out) and the buffer will come out but it will be under spring tension. Also, sometimes it helps to cock the hammer so the buffer will clear it. Once you get the buffer out, give it a shake back and forth. You will hear those weights rattle around inside. IMO it is not a big deal and in order for a game animal to hear it, it would have to be right on top of you and you would have to be shaking your rifle. However, it does bother some as does the action twang one sometimes hears when the rifle cycles. Again, not an issue to most shooters. Getting rid of the weight rattle is easy enough, albeit expensive, if you replace the weights with the same amount of tungsten powder. No more buffer weight rattle. The twang is a little harder to get rid of and honestly I do not know how one would get rid of it, or why one would want to anyway. My thoughts on that is that if the sound of the rifle firing does not scare off the animal the slight twang that accompanies the gun fire sure as hell won't.
techinny  [Member]
12/13/2010 7:08:38 PM
Thanks for the explination, it all makes sense. I agree, the noise is not loud enough to be an issue as far as spooking game, I am just used to being as quiet as possible in the woods. And if the animal is still around to hear the noise created by the action cycling, they are probably not going to hear it anyway.
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