The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > The Smithy

Thread Tools Search this Thread
Old March 21, 2011, 11:23 AM   #1
Junior Member
Join Date: October 15, 2002
Posts: 6
M1a problems - need help

Have a friend's rifle in the shop, keeps blowing the roller off the bolt. Bolt just back from SA and the roller blew off again after about 14 rounds of NATO spec ammo. Any thoughts? Suggestions of where to look first? Thanks!
The police of a state should never be stronger or better armed than the citizenry. An armed citizenry, willing to fight, is the foundation of civil freedom.
IronMikenaz is offline  
Old March 21, 2011, 03:53 PM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 13,835
I only own one of these, so I can only suggest where I would check if I had the problem. Look to be sure the barrel is timed on the receiver correctly so the op-rod is coming straight back and is not shoving the roller at an angle. Check that the op-rod guide isn't worn excessively. If you can, swap in the gas system from another gun to try it. That might help isolate the problem. Kuhnhausen has pretty good detail on op-rod fit, and you might check there for tips.

Walt Kuleck sometimes posts on this forum and he may well have other suggestions.
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Benefactor Member

Last edited by Unclenick; March 21, 2011 at 04:08 PM.
Unclenick is offline  
Old March 21, 2011, 03:54 PM   #3
Senior Member
Join Date: September 15, 2009
Location: Phoenix, AZ. 30 miles from water, two feet from Hell.
Posts: 355
Ask you question here
edward5759 is offline  
Old April 3, 2011, 10:58 PM   #4
Senior Member
Join Date: October 14, 2009
Posts: 141
Buy a new bolt and confirm that the headspace is unchanged. If the roller comes off the bolt, you can't really re-install it and expect it to stay unless you replace the lock ring which is inside the roller.

- Ivan.
Ivan is offline  
Old April 4, 2011, 02:35 PM   #5
James K
Join Date: March 17, 1999
Posts: 24,193
I am not sure what you mean by "blowing the roller off". Is there gas escape involved or is the roller just coming off and you are being a bit dramatic?

Jim K
James K is offline  
Old April 10, 2011, 05:04 PM   #6
Senior Member
Join Date: October 14, 2009
Posts: 141
By my understanding, the roller on the bolt was not removable except by grinding it off. It is pretty hard steel and you can't get to the retaining ring once it is installed. If it came off the bolt, the chance are pretty good that the bolt was damaged as a result. Get another bolt and roller or just a roller / retaining ring if you can be SURE that the bolt has not been damaged. Without seeing it, my guess is that you need another bolt.

- Ivan.
Ivan is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 04:30 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.06978 seconds with 9 queries