The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Semi-automatics

Reply
 
Thread Tools
Old June 6, 2014, 12:55 PM   #1
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Greenville, SC
Posts: 1,256
6.8 SPC buffer question.

I don't really see it mentioned, and I have been wondering.

Do you need a different/heavier buffer for 6.8?

I am running an H2 right now, and was wondering if I got an upper if I would need a new buffer.
marine6680 is offline  
Old June 6, 2014, 01:16 PM   #2
Metal god
Senior Member
 
Join Date: April 10, 2012
Location: San Diego CA
Posts: 1,961
I don't really know but EVERY time I've ask if there needs to be a different buffer or spring when making a caliber change . I was told no even when using those big single stack calibers . So I'm going to say no but the fact I just put that in writing means I'm wrong once again
__________________
As of this date 8-18-14 at 6:42am I became a proud grandfather I guess I'm officially old
Metal god is offline  
Old June 6, 2014, 01:39 PM   #3
Derbel McDillet
Senior Member
 
Join Date: September 6, 2013
Posts: 247
I installed a 20" 6.8 barrel on an older Colt AR15A2 Competition HBAR. The only other items I needed to swap were the bolt and magazine. The rifle functions flawlessly with the stock 5.56 rifle buffer.
Derbel McDillet is offline  
Old June 6, 2014, 01:45 PM   #4
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Greenville, SC
Posts: 1,256
OK then... My H2 should work then.


Now to wait until PSA has a 18" barrel upper on sale.
marine6680 is offline  
Old June 6, 2014, 03:57 PM   #5
bedlamite
Senior Member
 
Join Date: August 10, 2000
Location: WI
Posts: 1,031
If your gas system wasn't setup quite right, you can use buffer weight to fine tune it. If you see swipes without flat primers and/or you are ejecting toward the front of the gun, it's overgassed and a heavier buffer might help. If it's ejecting behind you, you may need a lighter buffer.
__________________
A plan is just a list of things that doesn't happen.
bedlamite is offline  
Old June 6, 2014, 04:00 PM   #6
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Greenville, SC
Posts: 1,256
Yeah... I was concerned the larger round would have timing issues without more buffer.

I can tune if I need.
marine6680 is offline  
Old June 7, 2014, 07:16 AM   #7
hodaka
Senior Member
 
Join Date: April 23, 2006
Location: South Texas
Posts: 1,822
My 6.8 with a 16 inch barrel and CAR stock beat the carbine buffer up so badly that the plastic part flattened out and would not slide in the tube. It only took a couple of thousand rounds to do it but it did. I replaced with a heavier carbine buffer and I do not see any damage so far. The ejection was still at 4-5 o'clock but the buffer was being hammered pretty badly.
hodaka is offline  
Old June 8, 2014, 09:13 AM   #8
marine6680
Senior Member
 
Join Date: July 24, 2012
Location: Greenville, SC
Posts: 1,256
Good to know.
marine6680 is offline  
Old June 8, 2014, 03:26 PM   #9
bedlamite
Senior Member
 
Join Date: August 10, 2000
Location: WI
Posts: 1,031
Hodaka, what length gas system do you have and do you know what size the port is?

You might also have a weak spring.
__________________
A plan is just a list of things that doesn't happen.
bedlamite is offline  
Old June 8, 2014, 05:35 PM   #10
hodaka
Senior Member
 
Join Date: April 23, 2006
Location: South Texas
Posts: 1,822
The gas tube is 9". I have no idea of the port diameter but mine is one of the earlier 6.8's and I'm pretty sure it is whatever is stock for a 5.56 CAR. It is a JT distributing upper. It has been working fine since i put in the heaviest buffer I could find.
hodaka is offline  
Old June 8, 2014, 09:03 PM   #11
reynolds357
Senior Member
 
Join Date: December 10, 2012
Posts: 2,238
Standard buffer is recommended. If you regularly maintain your rifle, you will see any signs of wear/damage early and be able to correct it accordingly.
reynolds357 is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.08321 seconds with 7 queries