New Posts New Posts RSS Feed - Barrett Adjustable Rings
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Barrett Adjustable Rings

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/16/2007 at 10:48
Graysteel View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: October/02/2007
Location: United States
Status: Offline
Points: 200

I have a set of Barrett adjustable rings that I am thinking about testing out in a couple of weeks. Has anyone had any experience with them? I know they are made by Barrett and are heavy as can be, but I still am not 100% sure about the whole friction fit adjustments. Does anyone have any idea what the coefficient of friction is on parkerized metal surfaces? I figure I could calculate the shear force needed to knock the rings out of adjustment by figuring out how much the pressure the two crossbolts apply to the lower part of the bases. Hmm... or... I can just beat it with a rubber mallet to see if it moves and decide if I am happy with the strength.... Why do I think I am going to end up beating with it the hammer.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/16/2007 at 20:06
Graysteel View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: October/02/2007
Location: United States
Status: Offline
Points: 200
Ok... No responses... guess it is time to break out that hammer...

On a side note I did call the folks over at Loctite about my habit wiping a thin layer of their product onto shear surfaces such as in-between scope rings / scope body, or friction binding adjustments like the Barrett rings. I was told that the Loctite will form a chemical bond (glue) and provide additional resistance to shearing movement.

The other interesting thing they told me is that once the chemical bond is broken and the surfaces start to slide the loctite forms a mechanical interference, sort of like putting grit on the surfaces to increase friction. As such it should not inadvertently act as a lubricant between parkerized/anodized surfaces. The engineer I spoke too seemed to think it was a 'reasonable' thing to do, but lacked any specific advice.

I figured that since I was offering as advice not just doing it to my own scopes I ought to do a bit more research.


Edited by Graysteel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/17/2007 at 08:56
Graysteel View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: October/02/2007
Location: United States
Status: Offline
Points: 200
 

I feel a little odd being the only person adding to this thread, but perhaps the information will be useful to someone at some point in time. Ok, last night I went down to the shop to test out the rings…

 

The test:

I made up a non-marring mounting rail out of two layers of ¼ inch thick hardboard and attached the base of the ring to the rail. From there I tightened the adjustments to about 75% of the recommended torque and measured the adjustment gap with calipers. I then cut a bit of thick leather to line the bottom of the ring and placed a section of schedule 40 pipe into the lower half of the ring. I then proceeded to tap (10 taps) on the pipe with a standard claw hammer.

 

The results:

The rings held fairly well, but not great. At the point I was tapping the pipe with the force that would approximate driving a 1.5" finishing nail into pine in 8-10 taps the rings began to shift. (about 20 thousandths). The rings were not marked at all, the friction fit simply slipped slightly. The test was repeated a couple of times. To be fair I suspect with that much impact you would likely damage most scopes before the rings themselves shifted and there was a thin film of oil (from the factory) on the shear surfaces.

 

My conclusion:

The rings are workable, but I would be careful to disassemble them and remove any oil from the shear surfaces when you get them. Next, I would make sure you tighten the binding bolts to their full specs and use a locking compound to make sure they don't loosen. And lastly, I would definitely put a drop of Loctite on the shear surfaces before tightening them down just to be safe. Oh.. and don’t beat your scope with a hammer.

 

Hope that is useful to someone.




Edited by Graysteel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/17/2007 at 14:46
cheaptrick View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: September/27/2004
Location: South Carolina
Status: Offline
Points: 20474

Thanks for the write up!!

I'm sure someone browsing this forum will appreciate that info. These write ups like yours are very useful to the forum members and guests.

 

Nicely done, Sir!!

 

 

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: October/21/2007 at 16:39
Chris Farris View Drop Down
TEAM SWFA - Admin
TEAM SWFA - Admin
Avatar
swfa.com

Joined: October/01/2003
Location: Texas
Status: Offline
Points: 7765

We tested a pair on one of our Barretts with no issues.  We are selling them now on eBay with NO RESERVE.

 

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/19/2008 at 17:17
mike4764 View Drop Down
Optics GrassHopper
Optics GrassHopper
Avatar

Joined: November/16/2008
Location: Albany NY
Status: Offline
Points: 49
I use them with no problems too.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: December/20/2008 at 12:53
rifle looney View Drop Down
Optics Master
Optics Master
Avatar

Joined: November/21/2008
Status: Offline
Points: 2553
GREAT! now we know ,I will try this on my next install albeit on a smaller scale. firearm that is.Excellent
 p.s--- because nobody answered we got a lot of info,thanx.
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Barrett Adjustable Rings"
Subject Author Forum Replies Last Post
Ring height, M99 Barrett and SS scope Cuznguido Rifle Scopes 2
Windage Adjustable Rings? Abitnutz Rings and bases 3
W&E adjustable mount/ring mortismaker Rifle Scopes 2
35mm scope tube: windage adjustable rings? TexasTransplant Rifle Scopes 2
30mm Windage Adjustable Weaver Rings? koshkin Rings and bases 3 6/12/2006 11:12:57 PM
Barrett M82-A1 Scope acropilot Rifle Scopes 0 1/30/2005 12:25:58 PM
scope for barrett 82 latewatcher Rifle Scopes 3 3/21/2006 7:42:28 AM
Barrett 416 single shot asphunter Firearms 3 5/4/2007 7:58:57 PM
Which scope Barrett 50 BMG semi auto RandyM Rifle Scopes 13
Barrett 50 Cal. drd34 Firearms 8


This page was generated in 0.422 seconds.