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P2000
06-05-12, 12:34
I was doing some toolbox rearranging and found this buffer that originally came with my pre M4carbine.net lower. I decided to take it apart out of curiosity, as I knew it wasn't correct. The buffer felt solid because nothing was sliding around in there. I don't have a scale, but it feels lighter than a H buffer. It is not marked and is missing the typical 3 flat sides. It came from a circa 2005 Ameetec "M4" lower. When I bought the lower I thought M4 meant it was military grade or at least of military design...

http://i82.photobucket.com/albums/j248/87228/P6050823.jpg

http://i82.photobucket.com/albums/j248/87228/P6050829.jpg

In addition to a one piece steel weight which fit snugly inside the housing, there was a dense rubber cushion to make sure there was no sliding back and forth going on.

Thanks to this site I am now able to spot some of the nonsense going on out there.
Ned Christiansen
06-05-12, 22:06
These also don't have the three flats for debris and to alleviate hydraulic resistance it it's fired wet and allow drainage.
amd5007
06-05-12, 22:10
These also don't have the three flats for debris and to alleviate hydraulic resistance it it's fired wet and allow drainage.

That's what those are there for? Interesting.
Ned Christiansen
06-06-12, 07:57
Just my presumptions. Never read it anywhere.
GTifosi
06-06-12, 09:40
That and/or to help prevent pnumatic damping when its moving at actual firing speeds.
SomeOtherGuy
06-06-12, 12:47
As a fellow owner of an Ameetec lower, now that I've learned a lot more this doesn't surprise me at all. My lower originally had a grind-to-fit buffer tube special, of course on a cheap commercial spec tube (since replaced). Some of the other construction actually seemed fairly well done, but I would now put these somewhere in the DPMS / Olympic league.

Mine was from 2007 and I think it had a correctly shaped buffer - I'll have to take a look at my buffer pile and see if I can find one that doesn't have flats machined, like the OP's.
BufordTJustice
06-06-12, 15:39
That and/or to help prevent pnumatic damping when its moving at actual firing speeds.

I've always thought this was the primary reason, with the fluid-draining abilities being secondary.

All that air has to go somewhere....
AR15barrels
06-07-12, 01:34
http://ar15barrels.com/tech/buffer-construction.jpg