Shim it with a proper steel one. .012 should get ya in the ball park.
If push comes to shove.
Probably your least expensive and easiest solution.

Aluminum can thickness is like .004 IIRC

Shims IMO are a band aid fix.....

The idea of steel or aluminum can stacked shims is bubba schitt in my mind.
But they will work.........

Not to mention the chance of a galvanic reaction between uncoated beer can aluminum alloy and gun steel.

I went thru this shim fiasco schitt with a VX3I 3.5x10-40 with lupy 2 peice bass and lupy low rings several years ago as their " solution" for a fugged up scope issue( I dont buy lupy anything anymore)

Other advice given on here is excellent also.
Wealth of knowledge for sure from guys.

The idea of a shim under a base would bother me.

It did when I did it.....seeing that gap under the base bugged the schit outta me.
And it was the lupy scope that was fugged up, their shim band aid fix was bullschitt for their fugged up scope.
Spun my wheels on that schitt.
Burn me once I'm done with your product.

Im really OCD with perfection, as I'm sure many others are also on here.

I would get the base,s 100% right and not have schitt bugging me.

Good luck with your project man!!!
I hope it turns out excellent!!!!!

Last edited by renegade50; 02/14/20.