Jump to content
308AR.com Community
  • Visit Aero Precision
  • Visit Brownells
  • Visit EuroOptic
  • Visit Site
  • Visit Beachin Tactical
  • Visit Rainier Arms
  • Visit Ballistic Advantage
  • Visit Palmetto State Armory
  • Visit Cabelas
  • Visit Sportsmans Guide
Sign in to follow this  
Ulysses

Bolt ring positions

Recommended Posts

On my Bushmaster M4, the reassembly instructions say the slits in the three bolt rings are to be evenly spaced (120 degrees between each of the splits in the three rings). On my DPMS .308 this is not required. Two questions: What is the reason for the even spacing instruction on the M4, and why is this not required on the .308?

Share this post


Link to post
Share on other sites
5 minutes ago, Ulysses said:

On my Bushmaster M4, the reassembly instructions say the slits in the three bolt rings are to be evenly spaced (120 degrees between each of the splits in the three rings). On my DPMS .308 this is not required. Two questions: What is the reason for the even spacing instruction on the M4, and why is this not required on the .308?

It's just like spacing rings in a piston on an engine build - so you have even compression across all cylinders.  The bolt is your "piston" and it's got rings.  The "cylinder" is the inside of your BCG.  Same rationale.

I will tell you that these things will still fire, when all the gaps are lined up.  Whenever I have my bolts out for cleaning, I space the ring gaps.  I don't take a gun apart to see if the rings are gapped, though. 

Share this post


Link to post
Share on other sites

kinda gun myth as it turns out over years of manufacturing.. do what the manufacturer says. saves you down the road if there is a problem. yet none here and tested many times on the feild. space them appropriately per manufacturer and see if they rotate on their own? but have confidence it will shoot. 

This just gave me a stupid idea.. remove the rings  and see what happens... dont do this Ul. 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...