Jump to content

Scope Mounts for AR advise


Recommended Posts

I have just recently acquired a Redfield illuminator 3x-12x scope and need scope rings to mount this on a AR15. The front outside diameter is 68mm and the scope body is 30mm. Can anyone tell me what size scope rings I need and where to find them. I am a complete novice at this, so I tried to research and had nothing but confusion as a result. It will likely go on the picatinny rail of an AR15.

Thanks in advance for your help......I'm old and the larger scope will help with my old eyes.....

Link to comment

You will most likely need a cantilever mount that allows you to keep the mount on the upper receiver while pushing the scope far enough forward for proper eye relief.  I can't advise exactly what length though.  Look at the offerings form Large, ADM, Bobro, and Midwest Industries.  You will most likely not be able to use standard rings and properly mount the scope on an AR.

  • Like 1
Link to comment

More than likely you will need a riser or a high mount set or rings.  My 50mm just barely sits above the hand guards (flat top), any bigger and it would be touching I'd think.  Something similar to this, but be sure to measure from the centerline of your lense to the bottom of your scope to make sure it will clear the rail.  




Link to comment

A common mistake in selecting a scope for the AR is the fact that it is not large objective friendly with the common full top rail. The scoping geometry of the AR pretty much maxes out with a 40mm objective IF you want the gun to handle with a good check weld and your close to medium range sight ins are relatively close as in point of aim. A 40mm gives you 2 1/4" above the line of bore.  A 68mm is going to put you some where around 3 and 3/8ths above the bore line.  Mounting high over the bore is never good for holding a greater zero'd point of aim with in short to medium ranges.   Its like instead of watching your bullet fly from the back side of the bullet, your looking down at it from above its flight path. Leupold fought the whole marketing of greater light transmission with anything bigger than 40mm for years with data but in the end it was easier to sell scopes with the "bigger is all ways better" schtick to the general public. A 40 mm can be mounted with basic Weaver extra high rings. Good luck on finding a good fit for a monster like a 68 mm.

Edited by xtriggerman
Link to comment

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


Tennessee Gun Owners (TNGunOwners.com) is the premier Community and Discussion Forum for gun owners, firearm enthusiasts, sportsmen and Second Amendment proponents in the state of Tennessee and surrounding region.

TNGunOwners.com (TGO) is a presentation of Enthusiast Productions. The TGO state flag logo and the TGO tri-hole "icon" logo are trademarks of Tennessee Gun Owners. The TGO logos and all content presented on this site may not be reproduced in any form without express written permission. The opinions expressed on TGO are those of their authors and do not necessarily reflect those of the site's owners or staff.

Before engaging in any transaction of goods or services on TGO, all parties involved must know and follow the local, state and Federal laws regarding those transactions. TGO makes no claims, guarantees or assurances regarding any such transactions.

  • Create New...

Important Information

By using this site, you agree to the following.
Terms of Use | Privacy Policy | Guidelines
We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.