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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 8/6/2005 1:25:45 AM EDT

I'm running a CMT flat-top with 'F' mark FSB and ARMS #40. I want a quick-detach for my Aimpoint ML but I want to end up with an Off-set co-witnessed, here the irons are usually in the lower 1/3 of the my Aimpoint sight-picture. I think the BUIR FAQ calls it 'Lower Third Co-Witness'.

What ARMS mount should I use? Or do I need another maker to get me this?

Thanks,

~Dave

Link Posted: 8/6/2005 1:30:44 AM EDT
ARMS doesnt make a mount that cowitnesses in the lower 1/3.


The only other option you have is the LaRue mount.
Link Posted: 8/6/2005 1:31:33 AM EDT
ARMS 22M68 with full spacer is as tall as you are going to get, but its not quite a 1/3. I recomend a LaRue mount anyway, its the proper height and much stronger, with a more advanced mechanism that retains zero better.
Link Posted: 8/6/2005 4:44:56 AM EDT
Try a Knights Arms mount. I use one on my flat top, with an Aimpoint, and a ARMS 40. I get a perfect lower 1/3 co witness.
MB
Link Posted: 8/6/2005 5:13:11 AM EDT

Originally Posted By Lumpy196:
ARMS doesnt make a mount that cowitnesses in the lower 1/3.


The only other option you have is the LaRue mount.





+1
Link Posted: 8/6/2005 5:29:26 AM EDT
Does anyone know what the actual difference in inches there is between absolute cowitness with a standard Colt FSB, and a lower 1/3 Cowitness? I have an Aimpoint QRP w/spacer in absolute and want to make it lower 1/3 cowitness. Need to know how high a riser I need or which one to use.


TIA
Link Posted: 8/6/2005 7:56:12 AM EDT
Thanks for the info but which Larue do I need?

Tall Aimpoint Mount or Cantilever Aimpoint Mount? And who has them... for a good price?

Thanks


~Dave
Link Posted: 8/6/2005 9:45:00 AM EDT
Link Posted: 8/6/2005 10:26:21 AM EDT
[Last Edit: 8/6/2005 6:09:11 PM EDT by Matt_B]
ARMS #22M68 with full or cantilever spacer = Lower absolute co-witness (1.61" above bore)
KAC Reflex Extension mount = Lower absolute co-witness (1.57" above bore)
Larue M68CCO straight or cantilever = Lower third co-witness (1.725" above bore)

Height Data is from this MSTN Thread.

I currently have 3 of the mounts listed (exclude the KAC) so I'm basing my definitions of co-witness types on personal experiences. While you may disagree with my definitions, you cannot dispute the actual heights because Wes knows his s--t.

ETA: Changed co-witness descriptions based upon Grant's post.
Link Posted: 8/6/2005 11:20:23 AM EDT
Sounds like I need a half spacer then.

Thanks all.
Link Posted: 8/6/2005 11:46:55 AM EDT
ARMS sucks, get a LaRue, and be done with it
Link Posted: 8/6/2005 12:51:10 PM EDT
[Last Edit: 8/6/2005 12:51:21 PM EDT by _DR]

Originally Posted By brian427cobra:
ARMS sucks, get a LaRue, and be done with it



Why do you think ARMS sucks?

Curious, because I have the ARMS M68 mount and it has served well.
Link Posted: 8/6/2005 3:14:38 PM EDT

Originally Posted By _DR:

Originally Posted By brian427cobra:
ARMS sucks, get a LaRue, and be done with it



Why do you think ARMS sucks?

Curious, because I have the ARMS M68 mount and it has served well.



I'm sure he bases his statement on well documented facts and years of field experience, and not just because Larue is the latest 'must have'.
Link Posted: 8/6/2005 5:01:57 PM EDT
Link Posted: 8/6/2005 5:04:16 PM EDT
Link Posted: 8/6/2005 5:06:17 PM EDT
Link Posted: 8/6/2005 5:33:05 PM EDT
[Last Edit: 8/6/2005 5:33:26 PM EDT by _DR]
Hate to see what everyone says about my QRP.

Oh well, budget dictates at the moment.
At least I don't have to use a Tacpoint and airsoft mount
Link Posted: 8/6/2005 5:42:02 PM EDT
Link Posted: 8/6/2005 5:57:02 PM EDT

Originally Posted By C4iGrant:

Originally Posted By _DR:
Hate to see what everyone says about my QRP.

Oh well, budget dictates at the moment.
At least I don't have to use a Tacpoint and airsoft mount



Nothin wrong with the QRP.


C4



Well just read somewhere here that it doesn't hold zero if you take it off, put it back on. but I got the QRP mount and spacer for under $45 new, so I got a decent deal. I'm hoping it will work out OK.
Link Posted: 8/6/2005 5:59:32 PM EDT
Link Posted: 8/6/2005 6:04:57 PM EDT
[Last Edit: 8/6/2005 6:05:31 PM EDT by _DR]

Originally Posted By C4iGrant:

Originally Posted By _DR:

Originally Posted By C4iGrant:

Originally Posted By _DR:
Hate to see what everyone says about my QRP.

Oh well, budget dictates at the moment.
At least I don't have to use a Tacpoint and airsoft mount



Nothin wrong with the QRP.


C4



Well just read somewhere here that it doesn't hold zero if you take it off, put it back on. but I got the QRP mount and spacer for under $45 new, so I got a decent deal. I'm hoping it will work out OK.



I never got my QRP to repeat zero 100% of the time, but you might have better luck. Try painting some witness marks on the knob and the mount. This should help.


C4



I'll try that, thanks for the tip.
Link Posted: 8/6/2005 6:13:53 PM EDT
Link Posted: 8/6/2005 6:17:31 PM EDT
Link Posted: 8/6/2005 6:19:15 PM EDT
I believe that LaRue is a better product. It is adjustable for different rail tolerances, has no spacer that will always come loose under recoil if you do not loctite it, and holds zero more reliably.
Link Posted: 8/6/2005 6:30:17 PM EDT
Link Posted: 8/9/2005 12:37:26 AM EDT
I think anyone who has owned a larue mount truly knows they are great. I love mine and will always own one.
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