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  
98Z5V

98Zs Mk12 Mod H in 6.5 Grendel

Recommended Posts

12 hours ago, N Doza said:

ave you found out if the collar on the BA 16" 6.5 SPR barrel is in the right location for the AE collar and won't tuck under the rail... looking at the pictures of the barrel I'd looks  farther away than normal

SmartSelect_20200327-100442_Gallery.jpg

SmartSelect_20200327-100431_Gallery.jpg

On the 16" they profiled it at 0.700" diameter 0.700" back from the barrel shoulder.  That's common, and they followed SPR specs on it.  Allen Engineering makes the collars:

852790670_AllenEng700by700stepcollar.thumb.png.6fcedcadfbf3c35bac9f5ec70118d712.png

Share this post


Link to post
Share on other sites

I'll break this down, for future historical information. 

This is all from the Mk12 SPR Program, and the original Mk12 Mod 0 gun. And, the innovative Ops Inc 12th Model suppressor.  Ops Inc is gone, But Ron Allen from Allen Engineering was the one that made most of those suppressors for Ops Inc anyway - And Ron Allen is doing well these days.  The direct replacement for an Ops Inc 12th Model can is the Allen Engineering AEM5 can -that IS the Ops Inc 12th Model, with different engravings.  Same can.  That IS the Mk12 SPR suppressor.

Here's what the barrel profile looks like with the SPR collar on the barrel, and the specs for that are below:

1296985204_AllenEngineeringSPRAEM5setup.thumb.png.6d86e363a7f8dbf74a01e37847124e7f.png

1709727974_AllenEngineeringSPRBarrelSpec.thumb.jpg.ed8153e4aa544bad823375c9b9d18301.jpg

the M4 barrel profile.  All Colt M4 (and M4A1) barrels had a 0.700" diameter, and they stepped up 0.700" back from the barrel shoulder.  To mount up the Ops 12th to the M4 and M4A1, this was the collar that you needed to make that happen - as well as the brake, of course.

m4_collar__51682.1578789732.png?c=2&imby

M4_barrel__31638.1578789732.png?c=2

1281052320_AllenEngineeringM4collarspecs.jpg.a950d56c222c72d871b0d79672b5ec74.jpg

Here's a pic that shows both the Mk12 and the M4 barrel - with their brakes and collars, to run the Ops 12th/AEM5 cans:

1306372360_AllenEngineeringSPRandM4collars.jpg.7b2460a6d246138a216f52b24a4a3e27.jpg

If your barrel is perfect on the Colt M4 barrel pattern, and has a true 0.700" x 0.700" step, then the M4 AEM5 Collar will allow you to mount up the cans, properly.

Lots of "mil-spec" barrels out there that are not truly mil-spec, and they fuk this measurement up.  Don't expect every "mil-spec" barrel to meet that 0.700" x 0.700" true M4 military specification... 

Edited by 98Z5V

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...