Why are adjustable rings so expensive?

Burris Signature "Z rings" will fit Weaver/Picatinny bases. They have "Posi-align" offset inserts up to + or - .020".

+ .020 at the rear, - .020" on the front would give you + 40 MOA at 3" ring spacing, 27 MOA at 4" ring spacing.

They are available in + or - .005", .010", .020" as well as standard 0.000" offset. One can use any combination of these to get the desired POA shift needed up to 40 MOA in about 4-5 MOA increments.

https://youtu.be/wcRAX5OLtJE?t=194


 
Some experts (YouTube guys - may or may not be experts) say scope ring inserts are bad for the scope, cause a lot of torsion. I needed a customization MOA adjustment for my Talon SS. I just couldn't get enough elevations out of the scope and I was always maxing it out, which isn't all that good for the scope either. I went with FX adjustable mounts and it fixed all my issues and I am extremely happy with them. They were $75 or so at Utah Airguns. Probably the best purchase I have made for the gun.

https://utahairguns.com/fx-no-limit-scope-mounts-picatinny/
 
After spending hundreds if not thousands on a nice rifle and a good scope why worry about a hundred for a scope mount? That is the key part for keeping that scope aligned! Just dont understand the thinking ......Been using Sportsmatch mounts for 30 yrs, never spent a hundred bucks on one and never had one fail to hold , even on heavy recoiling springers.
 
Some experts (YouTube guys - may or may not be experts) say scope ring inserts are bad for the scope, cause a lot of torsion. I needed a customization MOA adjustment for my Talon SS. I just couldn't get enough elevations out of the scope and I was always maxing it out, which isn't all that good for the scope either. I went with FX adjustable mounts and it fixed all my issues and I am extremely happy with them. They were $75 or so at Utah Airguns. Probably the best purchase I have made for the gun.

https://utahairguns.com/fx-no-limit-scope-mounts-picatinny/

On the contrary, inserts are designed to prevent torsion caused by misalignment of scope bases due to the occasional misalignment of scope base holes, especially on "sporterized" military actions. That was the original intent of the inserts. They are spherical in shape and float so to speak.
 
Some experts (YouTube guys - may or may not be experts) say scope ring inserts are bad for the scope, cause a lot of torsion. I needed a customization MOA adjustment for my Talon SS. I just couldn't get enough elevations out of the scope and I was always maxing it out, which isn't all that good for the scope either. I went with FX adjustable mounts and it fixed all my issues and I am extremely happy with them. They were $75 or so at Utah Airguns. Probably the best purchase I have made for the gun.

https://utahairguns.com/fx-no-limit-scope-mounts-picatinny/

On the contrary, inserts are designed to prevent torsion caused by misalignment of scope bases due to the occasional misalignment of scope base holes, especially on "sporterized" military actions. That was the original intent of the inserts. They are spherical in shape and float so to speak.

Exactly. Maybe he meant to say "shims"?