DDMAO,

TWO VARIABLES ARE AT WORK:

1. HEIGHT ABOVE THE COMB FOR A PROPER CHEEK WELD, AND...                    

2. SUFFICIENT EYE RELIEF.

THE SIGHTS ON A DETACHABLE CARRY HANDLE ARE 1.4" ON AXIS ABOVE THE RECEIVER. THIS GIVES YOU AN IDEA OF APPROXIMATELY WHAT YOU WANT FOR A SCOPE, AS WELL.

THE KAC SR25 30MM RINGS ARE 1.273" ON AXIS, A BIT LOWER, BECAUSE THEY WERE DESIGNED FOR THE SR25, WHICH HAS ABOUT 1/8" MORE DROP TO THE COMB OF THE STOCK. THEY WORK FOR ME, BUT THEY DO NOT PROVIDE ENOUGH ROOM UNDERNEATH AN ILLUMINATED LRM3 TO MOUNT A KAC 600-METER SIGHT. THE KAC 300-METER WILL FIT. NOTE THAT THE KAC 600-METER WILL FIT UNDER A NON-ILLUMINATED LRM3 IN THESE RINGS.

BOTH LEUPOLD AND BADGER MAKE AR15 RINGS. THEY ARE 1.40" ON CENTER. THEY ARE RATHER BLOCKY AND LACK THE EYE APPEAL THE KNIGHT'S RINGS PROVIDE, IMO.

ARMS MAKES THEIR #22 HIGH RINGS FOR FLAT TOP USE, 1.45" ON AXIS. THEY ARE LIGHTWEIGHT, GOOD QUALITY, REASONABLY PRICED, QUICK DETACH, AND HAVE EXCELLENT RETURN TO ZERO PROPERTIES. THESE ARE USED ON THE SPR MK 12 MOD 1 WITH THE LEUPOLD TS30A2.

PIC OF TS30A2 IN ARMS #22 HIGH RINGS:

[IMG]http://www.thermaldynamics.com/pictures/mstn/SPRTS30.jpg[/IMG]

THESE RINGS DO NOT ALWAYS PROVIDE SUFFICIENT EYE RELIEF WHEN MOUNTED ON A FLAT-TOP AR'. IN MANY CASES, WITH BIG SNIPER-QUALITY GLASS, YOU JUST CAN'T GET THE DANG SCOPE FAR ENOUGH FORWARD WHEN MOUNTED TO THE RECEIVER.

ARMS HAS VARIOUS SOLUTIONS FOR THIS. MY TWO FAVORITES ARE THE #36-EX BASE AND THE #35 QD BASE, WITH ARMS #35 TRACK-LOCK MEDIUM RINGS.  [THE LONGER #38 RAILS CAN ALSO BE USED, AS CAN THE #22 MEDIUM RINGS ON TOP.]  THESE BOTH GIVE YOU THE EQUIVALENT OF THREE MORE RECEIVER SLOTS, 1.18" OR THREE CENTIMETERS, MORE MOUNTING SURFACE FURTHER FORWARD FOR YOUR FRONT RING. THE AXIS OF THE SCOPE ENDS UP AT 1.55" WITH THE ARMS #36-EX AND #35 MEDIUM TRACK -LOCK RINGS. WITH THE #35 QD BASE AND #35 MEDIUM TRACK-LOCK RINGS, YOU'RE LOOKING AT 1.65".

THE #35 QD BASE WILL GIVE YOU ENOUGH ROOM FOR YOUR KAC 600-METER REAR SIGHT, TOO. WITH THE #36-EX, NO REAR SIGHT CAN BE USED.

HERE'S A PIC OF THE #35 QD BSE WITH MEDIUM RINGS:

[IMG]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=14359[/IMG]

I MAY BE WRONG, BUT IT CERTAINLY SEEMS TO ME THAT THE NEWER ILLUMINATED LRM3 I HAVE DEMONSTRATES SHORTER EYE RELIEF THAN AN EARLY EXAMPLE OF THE LRM3 THAT CAME ON MY MK 11.

WHAT THIS MEANS IS THAT WITH THE A2 STOCK OF THE SR-15 MATCH, YOU ...MAY... BE ABLE TO GET SUFFICIENT EYE RELIEF WITH THE ARMS #22 HIGH RINGS OR EQUIVALENT. I AM RUNNING SUCH A COMBO ON AN SPR WITH A MAGPUL MSS M93 OUT AT FULL A2 LENGTH. SEE PIC:

[IMG]http://www.thermaldynamics.com/pictures/mstn/SPR-MSS.JPG[/IMG]

WES GRANT
[URL]MSTN.BIZ[/URL]

J,

YES, THEY SHOULD BE AVAILABLE FOR CIVILIAN CONSUMPTION LATER IN THE YEAR. IT WILL CARRY A DIFFERENT DESIGNATION BUT WILL BE THE SAME SCOPE.

DDMAO,

I'M A BIG FAN OF THE 3.5 AND 4X ACOGS ON THE SPR, BUT NOT THE TA55. OPTICALLY, IT IS THE BEST TRIJICON MADE BUT IT IS JUST TOO HEAVY FOR THIS APPLICATION.

[IMG]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=13448[/IMG]

HERE'S A TA11 ON AN SPR BUILT FOR A SOON-TO-BE-HAPPY CUSTOMER.

WES GRANT
[URL]MSTN.BIZ[/URL]

THE SR-15 MATCH RIFLE ONLY WEIGHS 8.1 LB. I WOULD NOT ENCUMBER IT WITH SUCH A HEAVY PIECE OF GLASS THAT IS ONLY 5.5X.

I LIKE THE TA31 AND THE TA11 A LOT. BUT THERE'S NO WAY YOU CAN EXPECT "THE SAME LEVEL OF ACCURACY OUT TO ITS MAX EFFECTIVE RANGE" WITH THEM AT 3.5 OR 4X AS SOMETHING LIKE THE LEUPOLD LRM1 OR M3 AT 10X.

WES GRANT
[URL]MSTN.BIZ[/URL]

THE KAC 600-METER REAR SIGHT WILL EASILY FIT UNDER THE TRIJICON TA55 IN THE STOCK TA51 MOUNT.

WES GRANT
[URL]MSTN.BIZ[/URL]