The Firing Line Forums

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

Reply
 
Thread Tools
Old January 11, 2014, 09:21 AM   #1
Nathan
Senior Member
 
Join Date: July 1, 2001
Posts: 1,977
Buffer Weight vs Spring Weight in an AR15

Seems luck there is a lot of guessing that goes on with these 2 when an AR won't run.

The 2 are inter-related, so how do I know what I need? Especially in a Frankengun like mine! Mine is a rifle gas with a 17" barrel. Gas port was opened up when the barrel was shortened. Stock is a VLTOR EMOD kit which is probably sprung/buffed for a carbine.

It runs good with all brass 5.56 ammo I've put in it, including my reloads. It has struggled a bit before on Wolfe steel case about 5 years ago and I never tried again. Struggled means FTF.

It has FTF'd on reloads when quite dirty...BOB type FTF. <- this is very rare and never in my hands...it was a younger kid shooting it standing.

Normal brass case 5.56 gives me 3-4 o'clock ejection.

So, if I want to dig into this, what should I try first spring weight or buffer weight?

My goal is to make this run any ammo I can find marked 5.56, even when dirty.
Nathan is offline  
Old January 11, 2014, 05:41 PM   #2
rep1954
Senior Member
 
Join Date: July 5, 2009
Location: Mid Western Michigan
Posts: 737
I have a 11.5" barrel that ran well with most 5.56 ammo but fell short with some 55gr. .223 ammo. I had a 2.9 oz. buffer in it and switched to a 4.6 oz. and now it is completely reliable. The only steel case ammo I have ever ran in it is some Colt 62gr. galvanized and some Hertters 55gr. laquer coated and both have ran well.
rep1954 is offline  
Old January 11, 2014, 06:33 PM   #3
DubC-Hicks
Senior Member
 
Join Date: December 20, 2009
Location: Backwoods, Northern MI
Posts: 424
A rifle gas system on a 17" barrel is pretty undergassed, so I'd say you should get a standard 2.9-3 ounce buffer with a standard buffer spring. If that's what you already have, you may need a reduced power spring from Wolff or Sprinco.
__________________
”Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars.” ~Unknown
DubC-Hicks 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 01:47 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 0.07063 seconds with 9 queries