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

ArmaLite Vs DPMS Barrel Extension


Recommended Posts

I was always under the impression that the barrels were interchangeable.  I just ordered a barrel from Ballistic Advantage and didn't even pay any attention to the fact that it said "This .308 chambered (DPMS style) barrel...."  I have AR10Bs and this is what the upper will be that the barrel goes o.  I see out on the home page it says that the barrel extensions are not dimensionally the same.  WEll I was curious and took the barrel off one of my AR10Bs and measured it up against the barrel I jsut received from Ballistic advntage.  They look the same to me.

 

Here is the reciever side of the barrel extension flange to the edge of the extension for both barrels as well as from the barrel base inside the extension to the edge of the extension.

 

 

ArmaLite vs DPMS Barrel Extension 001.JPG

ArmaLite vs DPMS Barrel Extension 003.JPG

ArmaLite vs DPMS Barrel Extension 004.JPG

ArmaLite vs DPMS Barrel Extension 005.JPG

Link to comment
Share on other sites

...Here is the extension diameter measurements and the a measurement from the Barrel base inside the extension to the front of the extension bolt lugs.  If the measurements in the photographs don't look like they are exact it's because I am somewhat handicapped having only two hands.  It's hard for me to hold a ruler, flashlight, camera and barrel all at the same time.  I measured using a strong magnifying lupe and they are with in a couple of thousandths, if not exact, I would say.  I going to assemble in a few days and test fire.

 

Anyone know of a source for AR10B upper receivers by the way?

ArmaLite vs DPMS Barrel Extension 006.JPG

ArmaLite vs DPMS Barrel Extension 007.JPG

ArmaLite vs DPMS Barrel Extension 010.JPG

ArmaLite vs DPMS Barrel Extension 011.JPG

Link to comment
Share on other sites

All you're doing with those measurements is checking the exterior dimensions, and the headspace, in a sense, for a .308 Winchester round.

Get into the teeth in inside that barrel extension and see what you find - where the lugs on the bolt lock in.  That's what you need to focus on.

What you've measure doesn't matter, in the grand scheme of things. 

We've already got a whole big thread on the differences between the bolts and bolt carriers - there's where your meat and potatoes are.

I've already successfully built and run a complete Armalite AR-10 "guts" system in a DPMS-based receiver set - it works flawlessly.  Armalite complete BCG and barrel - and the recoil system, which really doesn't matter, system to system.

Edited by 98Z5V
Link to comment
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.

×
×
  • Create New...