ON THE AR' FAMILY OF WEAPONS, THERE ARE TWO CRITERIA REGARDING SCOPE MOUNTING THAT MUST BE TAKEN INTO CONSIDERATION FOR THE SCOPE TO BECOME AN EFFECTIVE PART OF THE SYSTEM:

1. HEIGHT ABOVE THE COMB

2. EYE RELIEF

THE IRON SIGHTS ARE 1.4" ON AXIS ABOVE THE AR-15/M-16/M-4 FLAT TOP UPPER RECEIVER. THIS TRANSLATES INTO THE AVERAGE HEIGHT ABOVE THE STOCK COMB FOR THE AVERAGE SHOOTER, AS ORIGINALLY ENVISIONED BY MR. STONER.

I HAVE SUCCESSFULLY USED SCOPE MOUNTING SYSTEMS AS LOW AS 1.25" ABOVE THE FLAT TOP AND AS HIGH AS 1.6" ABOVE THE FLAT TOP.

EYE RELIEF IS A FUNCTION OF THE SCOPE'S DESIGN. MOST HIGH QUALITY SCOPES ARE DESIGNED TO BE USED ON BIGGER CALIBERS THAN THE 5.56MM, NECESSITATING AN EYE RELIEF IN THE 3.6" - 4.0" RANGE, TO PREVENT THE SCOPE FROM COMING INTO CONTACT WITH THE SHOOTER'S SNOT LOCKER UPON RECOIL.

THE PROBLEM THIS PRESENTS WITH THE AR-15/M-16/M-4 FAMILY OF WEAPONS IS THAT THE UPPER RECEIVER IS OFTEN NOT LONG ENOUGH TO MOUNT A SCOPE ONTO AND AT THE SAME TIME PROVIDE SUFFICIENT EYE RELIEF.

WHAT TO DO?

MOUNT A SCOPE APPROX 1.4" ON AXIS ABOVE THE FLAT TOP UPPER. USE A STOCK LONG ENOUGH TO GIVE SUFFICIENT EYE RELIEF. HERE'S AN ACCURIZED 14.5" M4A1 WITH A LEUPOLD LRM3 MOUNTED 1.4" ON AXIS ABOVE THE RECEIVER, AS FAR FORWARD AS POSSIBLE, WITH THE CRANE STOCK PULLED OUT BEYOND A2 LENGTH:

[IMG]http://www.thermaldynamics.com/pictures/mstn/TanM4a1.JPG[/IMG]

MOUNT THE SCOPE ON A CONTINUOUS OR EXTENDED RAIL THAT WILL ALLOW ONE TO MOUNT A SCOPE FAR ENOUGH FORWARD TO PROVIDE EYE RELIEF.

AN EXAMPLE OF THIS IS THE LEWIS MACHINE & TOOL MRP, USING BADGER 1.40" ALLOY RINGS:

[IMG]http://www.thermaldynamics.com/pictures/mstn/MRP-5.JPG[/IMG]

[IMG]http://www.thermaldynamics.com/pictures/mstn/MRP-9.JPG[/IMG]

HERE IS ANOTHER EXAMPLE, ON A CLONE OF THE EARLY VERSION OF THE SPR, USING AN ARMS SPR RAIL AND ARMS #22 MEDIUM RINGS, PUTTING THE AXIS OF THE SCOPE 1.6" ABOVE THE FLAT TOP UPPER:

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

THIS CAN ALSO BE ACCOMPLISHED WITH THE ARMS #35 QD BASE WITH #35 MEDIUM TRACK LOCK RINGS:

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

YET ANOTHER WAY TO ACHIEVE THIS IS TO USE THE ARMS #36-EX BASE WITH RINGS OF CORRECT HEIGHT. SEE THE TOP WEAPON:

[IMG]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=1464[/IMG]


PERHAPS THE MOST ELEGANT SOLUTION IS A SCOPE ESPECIALLY DESIGNED FOR THE LOW RECOILING 5.56MM WITH A SHORTER THAN NORMAL EYE RELIEF, LIKE THIS LEUPOLD TS-30A2 ON AN SPR MK 12 MOD 1 CLONE, MADE OF UNOBTANIUM, IN ARMS #22 HIGH RINGS:

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

Hi Ghostface,

ARMS was back order on them.  We have been selling them.  I we ordered some ARMS #35 on 10/24/03.   They should not be a problem.

[url]www.csgunworks.com[/url]
[b]Here’s some testimonial about CS GunWorks for AR15 Board[/b]
[url]http://www.ar15.com/forums/topic.html?b=3&f=18&t=169925&page=1[/url]

 

Good luck he should be able to get them.

THE ISSUE IS SPECIFICALLY ADDRESSED IN MY POST, ABOVE.