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Posted: 3/21/2013 7:31:28 AM EDT
I've done a lot of looking around to find the best buffer weight for a 7.62x39 AR, and in various posts and places I've seen basically every weight recommended, along with a lot of 'whatever works'.  Understanding that adjusting may be needed, I'd like to pick the best weight I can starting out.  It seems to me that since the 7.62 is a heavier round than the 5.56 and will push back harder, a larger mass would be needed in the buffer.  What are your thoughts and opinions?
Link Posted: 3/21/2013 7:36:11 AM EDT
I've used my 762X39 upper on several different lowers, some with carbine buffers, and some with rifle buffers. I don't know the weights of the buffers, I just used whatever came in the kit or factory rifle.  Never had a problem with any of them.
Link Posted: 3/21/2013 8:27:45 AM EDT
Standard carbine buffer worked fine in my mid-length Armalite and carbine YHM x39s.  Eventually went to Spikes ST-T2 buffers in both because I had a couple of them doing nothing in a box and felt the need to put them to use.
Link Posted: 3/21/2013 9:54:09 AM EDT
I would go with the stock buffer unless your gun is showing signs of unlocking too early; ie: torn rims
or bolt not picking up the next round. If that is the case, you want to slow everything down with a slightly
heavier buffer. Like one of the above posters said, you could try a heavier one if you or buddy has one
sitting around.
Link Posted: 3/21/2013 12:39:34 PM EDT
Barrel length and gas system length make a big difference also, so would need to know that for accurate answer?
Link Posted: 3/21/2013 5:15:50 PM EDT
16" carbine
Link Posted: 3/22/2013 2:39:03 PM EDT
My 16" midlength works well with H & H2. Never tried anything else.

Just use what you already have, and buy a different weight if you need to.
Link Posted: 3/22/2013 5:24:00 PM EDT
Slash's heavy SS Tungsten buffer  with a wolff xp spring
Link Posted: 3/25/2013 11:16:14 AM EDT
Mine has never had an issue with either the ST-T2 in one lower or the H buffer in my other lower (both standard mil-spec springs).  Have also used it with my friend's A2 stocked rifle-buffer lower with not issues.  My upper is a 16" midlength from ARP though.  May not be the same for carbine gas.  I haven't tried it with any standard carbine buffers but it definitely runs great with the heavier ones.
Link Posted: 3/25/2013 12:12:38 PM EDT
16" carbine
I would use a H2 then.

Link Posted: 3/25/2013 7:15:28 PM EDT
I've been using an H2 and standard carbine spring with a midlength gas tube. Seems to hit the end of the buffer tube pretty hard (recoil :). 100% function though with ASC mags. Just ordered a Wolff XP spring as an experiment. Gas rings were wore completely out at 250-300 rds like they were not even there. Replaced with 1 piece mcfarlands. Ready to go again.
Link Posted: 3/25/2013 7:17:47 PM EDT
Buffer has a nice wear ring all the way around the edge from the back of the bolt. Another reason for the Wolff XP spring experiment.
Link Posted: 4/6/2013 12:14:26 AM EDT
How do you tell if you need a different buffer?

Ive got two of the x39 rifls-one a 16 inch mid length and the other a 16 inch carbine.
Both use what I expect are standard springs and carbine buffers.

what does a heavier buffer/spring do? When are they necessary?
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