Go Back   CMP Forums > CMP Sales > M1A/M14
Register FAQ Members List Calendar Mark Forums Read

Reply
 
Thread Tools Display Modes
  #11  
Old 02-09-2021, 04:17 PM
krdomingue krdomingue is offline
 
Join Date: Nov 2015
Location: Katy, TX
Posts: 1,407
Default

Quote:
Originally Posted by Ted Brown View Post
There is no correlation between various commercial receivers and commercial barrels that insure proper head space when switched.
I have gauges. I will check headspacing if I ever get the barrel on properly.
Reply With Quote
  #12  
Old 02-09-2021, 11:01 PM
gjungle56 gjungle56 is offline
 
Join Date: Nov 2011
Location: NE Illinois
Posts: 87
Default

As I stated earlier, I would check headspace at approximate tdc. It may be too long already. My experience has been that as tightened, the headspace will decrease by .002/.003 when going from hand tight to index tight. The barrel/thread timing, receiver face and lock lug position and(I'm assuming used barrel)in this case, chamber will determine usability, regardless of shim or roll. bear in mind, in this case it'll take .007 to .008 just to get to hand tight tdc plus what is needed to achieve proper tightness. Also, if not far off, Bula does make long/short bolts that can help
Reply With Quote
  #13  
Old 02-10-2021, 10:48 PM
mopardoctor mopardoctor is offline
 
Join Date: Dec 2009
Location: Barney Fife, Wa
Posts: 410
Default

Shims were made to be used on 03-A3s to get barrels to time up. They will fit M1 and and M14 also. Bought they on E-Bay.
Reply With Quote
  #14  
Old 02-11-2021, 09:50 AM
krdomingue krdomingue is offline
 
Join Date: Nov 2015
Location: Katy, TX
Posts: 1,407
Default

Quote:
Originally Posted by mopardoctor View Post
Shims were made to be used on 03-A3s to get barrels to time up. They will fit M1 and and M14 also. Bought they on E-Bay.
All I am finding look to be muzzle break or gas cylinder shims. Do you know what the proper size would be?
Reply With Quote
  #15  
Old 02-13-2021, 09:13 PM
krdomingue krdomingue is offline
 
Join Date: Nov 2015
Location: Katy, TX
Posts: 1,407
Default

Follow up:

I checked the go/no go gauges on the barrel and it passes fine. After looking at it a second time, I don't think it is that far from indexing and it should not need to be shimmed. I am thinking I can make it work by rolling it a little.

Thanks for the advise.
Reply With Quote
  #16  
Old 03-04-2021, 08:23 AM
nf1e nf1e is offline
 
Join Date: Apr 2012
Location: Connecticut
Posts: 2,649
Default

That's what we like to hear.
__________________
Semper Fi
Art
Sgt USMC 66 -72
RVN 67-68
Reply With Quote
  #17  
Old 03-29-2021, 12:09 AM
GMTECH485 GMTECH485 is offline
 
Join Date: Nov 2009
Location: Tacoma, Washington
Posts: 113
Default

The M1/M14 barrel has a convex shoulder that actually compresses when it is tourqed down.
It is there to keep the barrel tight.

Rolling the shoulder back on a used barrel is an acceptable process and will not effect the headspace at TDC as the convex shoulder will compress as it is tightened
Reply With Quote
Reply

Thread Tools
Display Modes

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



All times are GMT -5. The time now is 12:40 PM.