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Barrett ExRings dual MOA 15/40 or 30/40 Pin-Lock速

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/15/2011 at 20:28
338LAPUASLAP View Drop Down
Optics Master
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Wondering about these I am seriously considering these does anyone have any experience with them?

With dual MOA Barrett, ExRings with Pin-Lock速

http://www.barrett.net/optics/exrings


Specifications
  • Weight: 8.32 oz (235.9 g) (30 mm), 8.45 oz
    (239.6 g) (34 mm)
  • Size: 30 mm, 34 mm
  • Base Type: Mil-STD 1913 Rail
  • Tensile Strength: 83 ksi
  • Ring Width: 1.2" (3.05 cm)
  • Surface Gripping Area: 8.192 inch族
  • Material: 7075 T-6 Aluminum
  • Finish: Hard Anodized Black
  • Height: (Contact Point to Scope Ring Center) 1.0" - 1.7"
  • MSRP: Exrings $230.00 (30 mm) / $260.00 (34 mm),
    ZERO-GAP Rings $200.00 (30 mm) / $220.00 (34 mm),
    30 mm Accessory Ring Cap $79.99
Configurations
  • Part No.
  • 66850-A-KIT
    30 mm ExRings 15/40 MOA (1.6 high, Dual MOA Setting)
  • * 66858-A-KIT
    30 mm ExRings 20/30 MOA (1.6 high, Dual MOA Setting)
  • * 66870
    34 mm ExRings 20/30 MOA (1.7 high, Dual MOA Setting)
  • 66860-A-KIT
    30 mm ZERO-GAP Rings Low (1.0)
  • 66861-A-KIT
    30 mm ZERO-GAP Rings Medium (1.1)
  • 66862-A-KIT
    30 mm ZERO-GAP Rings High (1.3)
  • 66830-A-KIT
    30 mm ZERO-GAP Rings Ultra High (1.4)
  • * 66868
    34 mm ZERO-GAP Rings Medium (1.1)
  • * 66869
    34 mm ZERO-GAP Rings Ultra High (1.4)
  • * 66821
    30 mm Accessory Ring Cap

New product for 2010

Solution

Barrett ExRings with Pin-Lock technology has a dual setting MOA taper at 15 MOA or 40 MOA, utilizing the riflescopes precise internal elevation adjustment by aligning the scope for long-range shooting. The front ring assembly is designed with a precision fit pivot that allows the scope to elevate in the rear, but tolerances ensure no unwanted movement. The rear ring assembly houses the Barrett Pin-Lock technology that allows the user to select from two MOA settings. Once an MOA setting is selected and the rings four cross bolts are torqued to specification, Barrett ExRings become a rock-solid mount with the correct taper to maximize the potential of your rifle system.

XR Diagram

  • Key Features

  • ZERO-GAP速 offers wider clamping area and maximizes scope grip
  • Fits M1913 rails
  • Zero-backlash tongue and groove interface
  • High-strength aircraft-grade 7075 T-6 aluminum construction
  • 2.5 times lighter than steel
  • Heat-treated steel cross bolt and captured nut for increased strength
  • Hard anodized with a 60HRC (Rockwell C scale)
  • BORS速 compatible

Materials and Mass

When selecting a mounting solution for your optics, strength and weight are two important considerations. The greater the overall weight of your complete optics system, the greater inertia (the tendency of a body to resist acceleration) it will have. When a gun is fired, it recoils with instant acceleration. A heavy optics system mounted above the bore axis will resist the sudden rearward movement. A light-weight, strong mount is the best way to combat unwanted sight movement during recoil.

Barrett ExRings are constructed of high-strength 7075 T-6 aluminum. This material is ideal for the application due to its impressive strength; even more impressive strength-to-weight ratio when compared to heavier steels.

  Barrett 7075 Aluminum Others 1018 Steel Results
Tensile Strength 83 ksi 64 ksi 25% stronger
Tensile Strength Yield 73 ksi 54 ksi 25% Stronger
Weight 8.32 oz 11.5 oz 25% Lighter

Holding Area

Barrett ExRings are wider than typical rings at 1.2 inches. This creates a greater surface area of contact between the ring and scope maintube. The benefit is a secure g

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/16/2011 at 01:52
Urimaginaryfrnd View Drop Down
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should be good but anything wiht adjustable MOA worries me.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/16/2011 at 08:05
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Optics Master
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It is a simple pin system it looks fixed once you change the pin and lock it down.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 01:06
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I have a set but have not used them on a rifle yet. When assembled the adjustment pin and pivot are blocked in by one of the side bolts that clamp (lock) the assembly together.  The pins (pivot and adjustment) have a very tight fit and have to be driven out with a punch and a small hammer.  The adjustment design is set up such that it is either 15 or 40 minutes with no in-between settings.  I did consider changing the recommended spacing (9 slots apart) between the front and rear ring assembly to change the 15/40 minutes range but disregarded the idea because it would bind the scope tube.  It might be possible to get in-between settings by leaving the rear (adjustment) pin out and relying only on the side bolts to hold zero, but would recommend against it for the obvious reasons that it could then slip.  Over all they appear well made.

dsr
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 09:08
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Optics Master
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Thank you for that information.

I will only be using the 40MOA setting as that is more than I ever thought would be available in the rings alone and will help me to accomplish my overall goal.


Edited by 338LAPUASLAP - April/17/2011 at 09:10
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 10:13
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Barrett builds "workman" stuff.  Designed for use in the field.  I think you will be fine...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/17/2011 at 11:15
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Optics Master
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I've done a little work with them before, Never knew they made this style of rings.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2011 at 21:41
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Optics Master
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HOLY CRAP...

BUILT LIKE A TANK.

I will try to upload pictures If I can get my camera to work for the close-ups.

They are not mounted yet as I am waiting for the correct scope...

Japan Glass suppose to be in 1st week of May...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/20/2011 at 22:01
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Can hardly wait for some good pictures. 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/23/2011 at 13:36
dsr View Drop Down
Optics Apprentice
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Look forward to seeing the pics when you get them posted.
Yippee  Sharp Shooter
dsr
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/25/2011 at 14:54
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Optics Master
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Ok so here are some pics unmounted of course getting others ready as soon as mounting is possible.





















1





Edited by 338LAPUASLAP - April/25/2011 at 14:55
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2011 at 21:19
dsr View Drop Down
Optics Apprentice
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Wow, yours came in a nifty box with a Barrett name plate -- mine were only in cheap plastic.
 
I do like the disply name tag that they sent with it - nice touch.
 
dsr
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