I was at Camp Perry recently and had to take SAFS ( rifle ). I noticed that the old, rattletrap FNMI M-16A2 I was using had NO buffer spring rattle when I released the bolt. The carrier slid forward and clicked/clacked/locked right into place.

Now with an Eagle Arms M15A2 I saw over there in the hands of a High Master, I heard none, just a solid action....

But with my Colt 20" 6601-type, I have an insane amount of it when I close the bolt...

Is it because one has an M-16 carrier and the other doesn't? Maybe the buffer springs in the FNMI and Eagle Arms rifle are longer/stronger?

How can this be? What causes it to rattle so much/little?

Spring noise...hmm.  I noticed several of my guns have it more severely than others.  Last weekend I was shooting my 16" HB and noticed the spring was real loud.  If I lifted my head off the stock, I couldn't hear it at all....go figure.  Use the search feature and you will see lots of info about this.  I like the sound, and it let's you know everything is working ok.

Hmm... did a search, ended up with results for the Wolff extra power buffer sping ( more thrust per squeeze? ).

BTT.

Do we have any more users of this buffer spring? How do you like it?

I would be more worried about a weapon that DIDN'T make a sproing, fr00t l00ps!

Can't say the same applies to me, it only bothers me when I'm single loading cartridges for slow-fire stages. When I fire in the rapids, I find too much of the noise annoying, and kind of distracting.

Quoted: I was at Camp Perry recently and had to take SAFS ( rifle ). I noticed that the old, rattletrap FNMI M-16A2 I was using had NO buffer spring rattle when I released the bolt. The carrier slid forward and clicked/clacked/locked right into place. Now with an Eagle Arms M15A2 I saw over there in the hands of a High Master, I heard none, just a solid action.... But with my Colt 20" 6601-type, I have an insane amount of it when I close the bolt... Is it because one has an M-16 carrier and the other doesn't? Maybe the buffer springs in the FNMI and Eagle Arms rifle are longer/stronger? How can this be? What causes it to rattle so much/little?

I saw a gunsmith put moly grease on the spring , poof no more noise

www.sinclairintl.com/cgi-bin/category.cgi?category=search&item=14-5200&type=store

Thank you Gray, and Obi-Wan.

Quoted: Quoted: I was at Camp Perry recently and had to take SAFS ( rifle ). I noticed that the old, rattletrap FNMI M-16A2 I was using had NO buffer spring rattle when I released the bolt. The carrier slid forward and clicked/clacked/locked right into place. Now with an Eagle Arms M15A2 I saw over there in the hands of a High Master, I heard none, just a solid action.... But with my Colt 20" 6601-type, I have an insane amount of it when I close the bolt... Is it because one has an M-16 carrier and the other doesn't? Maybe the buffer springs in the FNMI and Eagle Arms rifle are longer/stronger? How can this be? What causes it to rattle so much/little? I saw a gunsmith put moly grease on the spring , poof no more noise

Yessir. I just dab a little wheel bearing grease on the buffer & spring and like you said, POOF! No noise. I do that with all my AR15's.

My buffer doesn't "sproing" as much as my buddy's SP1, but it does occassionaly have a
delayed resonance...more of a quick "hum" for about 1 sec.  But this is more pronounced
when the earmuffs are contacting the stock/tube.

my .02