 HercMech 
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Joined: Sep 2005  IL, USA
 Posts: 519 Feedback: 0% (0) |
Posted: 6/14/2012 6:26:25 PM
[Last Edit: 6/14/2012 7:18:31 PM by HercMech]
I am super excited that my Burris MTAC, Primary arms extend mount and butler creeks arrived.
Now for the but...I am bummed cause it will not fit on my M4 with the KAC RAS II upper. The mount does not get high enough to clear the attachment point on the upper to forearm mount with that rail system. 
Anybody have any ideas? |
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MARSH1
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Joined: Mar 2007 TX, USA
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Posted: 6/14/2012 8:02:35 PM
That is a odd setup. Is the mount hitting? Would tall rings work? Post a pic might help us come up with a solution.
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Posted: 6/14/2012 8:37:05 PM
[Last Edit: 6/14/2012 8:39:39 PM by HercMech]
Here is a picture of the RAS II. (Not my picture but illustrates the problem) My aimpoint cantilever looks like it was made for the system. (Note that is not my Trijicon):
Here is a view of it without an optic on it: 
As you can see the attachment area is pretty tall. I have plenty of rail space left between the BUIS and the attachment. |
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Posted: 6/15/2012 12:54:29 AM
Sorry to hear. That's one of the reasons that rail never took off.
You'll likely have to get a riser that fits behind it. I'm not sure any offset scope mount is going to work with that rail. |
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MARSH1
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Posted: 6/15/2012 8:30:49 AM
t would help to have a pic of your setup showing where the scope or mount is hitting.
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Posted: 6/15/2012 11:37:58 AM
Here are some pictures of the issue. The first one is of the Aimpoint, the second is the issue I am having with mount. it is not mounted because I can't get it attached.
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Posted: 6/16/2012 6:57:12 PM
No ideas?
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Posted: 6/16/2012 11:23:33 PM
[Last Edit: 6/16/2012 11:25:18 PM by Cageylaw]
Have you considered small risers? Perhaps a pair of YHM mini risers...
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MARSH1
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Joined: Mar 2007 TX, USA
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Posted: 6/17/2012 7:49:18 AM
[Last Edit: 6/17/2012 7:52:35 AM by MARSH1]
With a lower rear flip two of our AR height rings would work. The scope will be a little further to the rear than ideal. The riser rail would work but not going to get a very good cheek weld.
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Posted: 6/17/2012 11:47:51 AM
[Last Edit: 6/17/2012 10:17:48 PM by HercMech]
Originally Posted By MARSH1:
With a lower rear flip two of our AR height rings would work. The scope will be a little further to the rear than ideal. The riser rail would work but not going to get a very good cheek weld. Thanks Marshall. I may give that a try. You think I can get two mounts on the space I have left? Got to thinking if maybe a low mount on the forward piece and a standard mount on the rear would work? The forward piece is bolted on so it is rock solid...hmmm |
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MARSH1
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Joined: Mar 2007 TX, USA
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Posted: 6/18/2012 10:22:27 AM
Originally Posted By HercMech:
Originally Posted By MARSH1:
With a lower rear flip two of our AR height rings would work. The scope will be a little further to the rear than ideal. The riser rail would work but not going to get a very good cheek weld. Thanks Marshall. I may give that a try. You think I can get two mounts on the space I have left? Got to thinking if maybe a low mount on the forward piece and a standard mount on the rear would work? The forward piece is bolted on so it is rock solid...hmmm Two rings should fit close together. I thought about two different height rings but they would have to line up perfectly. It would be tough to find just the right height. |
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Posted: 6/18/2012 10:35:23 AM
Is the rest of the handguard not the same height as the receiver rail? I know it's not ideal, but I would just put a ring on the handguard and a ring on the receiver.
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MARSH1
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Joined: Mar 2007 TX, USA
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Posted: 6/18/2012 12:08:37 PM
[Last Edit: 6/18/2012 12:08:51 PM by MARSH1]
Originally Posted By EB_311:
Is the rest of the handguard not the same height as the receiver rail? I know it's not ideal, but I would just put a ring on the handguard and a ring on the receiver. Good idea!!!! |
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Posted: 6/19/2012 3:37:17 AM
Hmm now that could work. I think the rail would be stable enough. It is bolted pretty tight to the upper. I guess the high rings would put it high enough to go over the "hump"
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Posted: 7/9/2012 2:57:43 PM
Got some rings and tried them. Didn't work...the forearm is a bit higher and to the right.
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MARSH1
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Posted: 7/9/2012 6:47:59 PM
Originally Posted By olds442tyguy:
Sorry to hear. That's one of the reasons that rail never took off. You'll likely have to get a riser that fits behind it. I'm not sure any offset scope mount is going to work with that rail. I will cut you a deal on a new quad rail. |
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Posted: 7/9/2012 7:42:24 PM
Originally Posted By HercMech:
Got some rings and tried them. Didn't work...the forearm is a bit higher and to the right. That sucks man. Originally Posted By MARSH1:
Originally Posted By olds442tyguy:
Sorry to hear. That's one of the reasons that rail never took off. You'll likely have to get a riser that fits behind it. I'm not sure any offset scope mount is going to work with that rail. I will cut you a deal on a new quad rail.  Can't beat that offer. |
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Posted: 7/10/2012 10:40:44 AM
Originally Posted By MARSH1:
Originally Posted By olds442tyguy:
Sorry to hear. That's one of the reasons that rail never took off. You'll likely have to get a riser that fits behind it. I'm not sure any offset scope mount is going to work with that rail. I will cut you a deal on a new quad rail. Thanks Marshall...that is a hell of an offer. I was after the Omega rail...you were out of stock, so a buddy hooked me up. You guys (PA) are top notch people and I always give you first look. |
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the444shooter
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Team Member
Joined: Apr 2003 TX, USA
Posts: 526 Feedback: 100% (33) Link To This Post |
Posted: 7/10/2012 9:30:00 PM
Why not use a small riser(s) like what was suggested earlier?
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Posted: 7/11/2012 1:26:56 PM
[Last Edit: 7/11/2012 1:27:43 PM by HercMech]
Using risers would take it a little high for me.
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Posted: 7/12/2012 2:50:00 PM
Got it all installed now...love the set up...thanks again for the super service Marshall and Primary Arms.
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